Question (1 Viewer)

[qldbulls]

Got this in a 2 unit past paper, would I be awarded marks if I used a u-sub or do I have to do a advanced-syllabus method which I am completely stumped on someone please remind me

 

[scaryshark09]

Got this in a 2 unit past paper, would I be awarded marks if I used a u-sub or do I have to do a advanced-syllabus method which I am completely stumped on someone please remind me

View attachment 39770

just use adv method, using u-sub it too risky.
its a very simple question btw. cosx is the derivative, so integral is (sinx^3)/3
its just the chain rule i think its called

 

[SadCeliac]

just use adv method, using u-sub it too risky.
its a very simple question btw. cosx is the derivative, so integral is (sinx^3)/3
its just the chain rule i think its called

chain rule is when you differentiate [f(x)]^n to get nf'(x)[f(x)]^n-1

reverse chain rule (which is what sharky meant) is when you do the opposite (ie. during integration)

Got this in a 2 unit past paper, would I be awarded marks if I used a u-sub or do I have to do a advanced-syllabus method which I am completely stumped on someone please remind me

View attachment 39770

basically you see that you have cosx which is the derivative of sinx

honestly you could use u-sub if it makes it clearer for yourself, I used to do it when I did 2u, but you don't get any extra marks --I assume that was a 2 marker??

 

[qldbulls]

Oh right I was just overthinking it. sin^2(x) = (sinx)^2 duh
Thank you

 

[SadCeliac]

Oh right I was just overthinking it. sin^2(x) = (sinx)^2 duh
Thank you

yeah keep that in mind when solving

any other integration qs you're struggling with?

 

[SadCeliac]

https://www.integral-calculator.com btw this is a great place for step by step sols if you ever need to double check an answer

 

[snodgrass1001]