Mathematics: Post your doubts here!

[DragonCub]

Thanks Sir! It's brilliantly done, but if I may. For the 1st question my only concern is why did you only take the absolute value for a=3 and did not also consider the case where $a$ can be equal to -3 ?

 

[SpawnX-1200]

View attachment 61731

True shame on me xD.

Your help was very much appreciated, also I see you manage to write your equations beautifully. I'm new to the forum and I know it's a bit off topic but does the forum support latex to write the mathematics?

 

[DragonCub]

True shame on me xD.

Your help was very much appreciated, also I see you manage to write your equations beautifully. I'm new to the forum and I know it's a bit off topic but does the forum support latex to write the mathematics?

Glad to see you find my answer helpful.
As of now, the rich text editor in the forum doesn't quite support insertion of equations. I used MS Word instead, and converted the lines to images. You can see that the answer I provided was actually image files.

 

[SpawnX-1200]

Glad to see you find my answer helpful.
As of now, the rich text editor in the forum doesn't quite support insertion of equations. I used MS Word instead, and converted the lines to images. You can see that the answer I provided was actually image files.

Well on 1st look with the black bg one wouldn't figure these were images. Well done. I think the guys working and maintaining the forum would gain a lot to implement/support latex. It basically allows you write mathematics perfectly.

 

[krishnapatelzz]

anyone having solved papers from 2002 to 2010 ? for pure maths 3 . if anyone have even one paper u can reply . if not that then any videos which is related to solving of pastpapers from 2002 - 2010

 

[Thought blocker]

anyone having solved papers from 2002 to 2010 ? for pure maths 3 . if anyone have even one paper u can reply . if not that then any videos which is related to solving of pastpapers from 2002 - 2010

Not all of them are uploaded by anyone. YOu can buy them if you want I cana provide you a link.

 

[krishnapatelzz]

for part (ii) i dont understand the M1 mark , i dont understand why did we do that step (18=-54/3+C)

 

[Thought blocker]

View attachment 61748 View attachment 61748 for part (ii) i dont understand the M1 mark , i dont understand why did we do that step (18=-54/3+C)

s = v x t
v = 54/9
s = 54/3 = eighteen.

Its just we did substitution bro.

 

[krishnapatelzz]

i

s = v x t
v = 54/9
s = 54/3 = eighteen.

Its just we did substitution bro.

i am not asking how we did .. i am asking y did we do . wo step karne se kya milenga

 

[krishnapatelzz]

s = v x t
v = 54/9
s = 54/3 = eighteen.

Its just we did substitution bro.

better can u solve part 2 step by step

 

[Thought blocker]

better can u solve part 2 step by step

Ok wait check whats app in a while

 

[DragonCub]

View attachment 61748 View attachment 61748 for part (ii) i dont understand the M1 mark , i dont understand why did we do that step (18=-54/3+C)

PS. In case you are interested... Click on the spoiler below.

Spoiler

This method gets rid of the annoying c constant, which you need to solve like solving an algebraic equation.

 

[krishnapatelzz]

why is it 30g sin 30 , as per sohcahtoa sin 15 should be equal to 30g/hypotaneous . but here they seem to have done sin 15 = hypotaneous /30g

 

[DragonCub]

View attachment 61759 why is it 30g sin 30 , as per sohcahtoa sin 15 should be equal to 30g/hypotaneous . but here they seem to have done sin 15 = hypotaneous /30g

You designated the wrong direction as hypotenuse.
The 30 g should be the hypo, and then you can see everything makes sense.

 

[krishnapatelzz]

You designated the wrong direction as hypotenuse.
The 30 g should be the hypo, and then you can see everything makes sense.

but that is opposite to 15 degree so it should be opposite

 

[DragonCub]

but that is opposite to 15 degree so it should be opposite

You chose the wrong "15 deg".
Use the 15 deg here:

 

[krishnapatelzz]

You chose the wrong "15 deg".
Use the 15 deg here:
View attachment 61760

ok by that i understood how we got 30g cos 15 . but still dont understand for sin

 

[DragonCub]

ok by that i understood how we got 30g cos 15 . but still dont understand for sin

 

[krishnapatelzz]

View attachment 61761

ohhhhhhhhhhhhhh ok

 

[krishnapatelzz]

Q1