# Mathematics: Post your doubts here!

#### blymphocytes

No ....derivative of y^3 is 3y^2 this should be present.
So 3y^2 should be the numerator?.......Always??

#### blymphocytes

So 3y^2 should be the numerator?.......Always??
Liek for all denominators....the numerator should be a derivative in order to use ln?

#### Hamnah Zahoor

Liek for all denominators....the numerator should be a derivative in order to use ln?
correct

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#### blymphocytes

For remembrance it's given on the formula sheet
Thanks.....once again!!!

#### fourtris46

can anyone please send me the working of feb19 q3?

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#### 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.