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c4 integration help watch

1. 10i

I have subbed in sin x

And got 1/cos^3x ... What next?
2. (Original post by IShouldBeRevising_)

10i

I have subbed in sin x

And got 1/cos^3x ... What next?
Post your working. This is a lot simpler.
3. Firstly and then find in terms of . Finally, find the limits in terms of and evaluate the integral.
4. Right now your integral is

You can't integrate with respect to 'x'. What have you still got to do?
5. Put in terms of , i.e. x = sin(theta) => dx/d(theta) = ...
6. (Original post by IShouldBeRevising_)

10i

I have subbed in sin x

And got 1/cos^3x ... What next?
If you've put then you shouldn't have any x terms left in the integral. Your denominator becomes , and you need to convert to

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