# Mathematics: Post your doubts here!

#### fourtris46

in the last step, why did you multiply and divide with square root 2 ?

#### Hamnah Zahoor

in the last step, why did you multiply and divide with square root 2 ?
Just to simplify it more ..it's not a necessity .
And I just read the question it says no need to simplify the answer thus you can give the answer without multiplying and dividing by square root 2.

#### fourtris46

Just to simplify it more ..it's not a necessity .
And I just read the question it says no need to simplify the answer thus you can give the answer without multiplying and dividing by square root 2.
thank u so muchhhh

#### Hamnah Zahoor

Can someone possibly show me the working of question 5, feb march paper 32 2019?

#### Hamnah Zahoor

Can someone possibly show me the working of question 5, feb march paper 32 2019?
I solved it rougly I hope it is understandable

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Thanks, can you show me question 7 as well?

#### Ebrahim12

Welp, finally done with my exams.

Anyone else did 32 today?

#### hellodjfos;s'ff

Welp, finally done with my exams.

Anyone else did 32 today?
Yeah how was it? Fine paper but not enough time. Still did well enough to get an A* - best case scenario would be 71, worst case scenario would be 68 so I'll lose 5-6 marks I'm guessing.
Forgot about the constant in differential equation so one mark lost there, didn't attempt the expand sin(3x+x) and sin(3x-x) part at all as I ran out of time. So losing 4 marks and I could lose 3 more potentially for method marks in AB=2rcosx proof and differential equation part(ii) which was one mark(differential equation question was a repeat from march 2016 question 7 and the mark scheme only says 'justify statement' for part ii which is very vague).

Overall, everyone had problem with timing so threshold would be about 57-59 for an A in p3 and A* in maths will be about 228-230.

#### Ebrahim12

Yeah how was it? Fine paper but not enough time. Still did well enough to get an A* - best case scenario would be 71, worst case scenario would be 68 so I'll lose 5-6 marks I'm guessing.
Forgot about the constant in differential equation so one mark lost there, didn't attempt the expand sin(3x+x) and sin(3x-x) part at all as I ran out of time. So losing 4 marks and I could lose 3 more potentially for method marks in AB=2rcosx proof and differential equation part(ii) which was one mark(differential equation question was a repeat from march 2016 question 7 and the mark scheme only says 'justify statement' for part ii which is very vague).

Overall, everyone had problem with timing so threshold would be about 57-59 for an A in p3 and A* in maths will be about 228-230.
Yeah time was tight for me too
Don't know/think I did anything wrong and I just need to lose less than 8 marks for a star even with high grade boundaries

Hate it when they pull the vague answers in the ms, why even bother at that point

#### PhantomFlash

Spaced out mid exam.
Couldn't finish in time.
Would've landed an A if I had better concentration.

Can anyone type in the answers if you remember them?

#### hellodjfos;s'ff

Spaced out mid exam.
Couldn't finish in time.
Would've landed an A if I had better concentration.

Can anyone type in the answers if you remember them?
I am so exhausted that I remember very few answers. Usually I'll remember all the answers but this exam has drained the life out of me.
1. Coefficient was 6 maybe(don't remember properly)
2. Log question: x=0.126 - don't remember properly
5. Complex number roots question: k=2
7. Refer for m16 paper for answer, answer is complicated and c=0 - differential equation
Plane question: Equation of plane M was 4x-2y-4z=5(signs maybe off as i don't recall this one properly)
Shaded region= 9/16, value of stationary point's x-coordinate=1.3
Iteration was the easiest of the last few questions so don't remember it at all.

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#### A*****

I am so exhausted that I remember very few answers. Usually I'll remember all the answers but this exam has drained the life out of me.
1. Coefficient was 6 maybe(don't remember properly)
2. Log question: x=0.126 - don't remember properly
5. Complex number roots question: k=2
7. Refer for m16 paper for answer, answer is complicated and c=0 - differential equation
Plane question: Equation of plane M was 4x-2y-4z=5(signs maybe off as i don't recall this one properly)
Shaded region= 9/16, value of stationary point's x-coordinate=0.13
Iteration was the easiest of the last few questions so don't remember it at all.
X coordinate in the last part wasn't this, it was greater then 1...the diagram clearly showed that it had to be between π/3 (the upper boumdary calculated for area in the previous part ) and π/2

#### hellodjfos;s'ff

X coordinate in the last part wasn't this, it was greater then 1...the diagram clearly showed that it had to be between π/3 (the upper boumdary calculated for area in the previous part ) and π/2
Thank you for refreshing my memory. Yes it was 1.3(i mean that's what I got).

I got 1.2 something, it said write down your answer to 2 decimal places

#### hellodjfos;s'ff

I got 1.2 something, it said write down your answer to 2 decimal places
Yeah yeah I remember, I wrote 1.30.

#### BQRS01

Yeah how was it? Fine paper but not enough time. Still did well enough to get an A* - best case scenario would be 71, worst case scenario would be 68 so I'll lose 5-6 marks I'm guessing.
Forgot about the constant in differential equation so one mark lost there, didn't attempt the expand sin(3x+x) and sin(3x-x) part at all as I ran out of time. So losing 4 marks and I could lose 3 more potentially for method marks in AB=2rcosx proof and differential equation part(ii) which was one mark(differential equation question was a repeat from march 2016 question 7 and the mark scheme only says 'justify statement' for part ii which is very vague).

Overall, everyone had problem with timing so threshold would be about 57-59 for an A in p3 and A* in maths will be about 228-230.
Grade boundaries for A* might be lower like 225-227 because of Paper 12 as well. What do you think?

#### hellodjfos;s'ff

Grade boundaries for A* might be lower like 225-227 because of Paper 12 as well. What do you think?
Unlikely that they will go below 227 for those that gave AS and A2 separately and not below 229 for those that gave AS and A2 together.

#### BQRS01

Unlikely that they will go below 227 for those that gave AS and A2 separately and not below 229 for those that gave AS and A2 together.
In that case let’s hope for a 227 Grade boundary for those that did AS and A2 separately. Fingers crossed...

#### FarGang

Any idea regarding the grade boundary for A? I did AS and A level separately?