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# trig functions helP!! watch

1. evaluate the integral of coshx sinh^2 dx limits are a=0,b=1
2. Notice that coshx is the derivative of sinhx so you have:
f'(x) * f(x)^2

What's the integral of something of this form?
3. can u write the full answer plz!
4. (Original post by f40spider)
can u write the full answer plz!
Try differentiating by the chain rule.
You should get something that looks similar to what you're trying to integrate. You can make it exact by multiplying by a constant (constants do not affect differentiation/integration).
For the purposes of this you can think of integration as reverse differentiation, for example if you differentiate x^2 you get 2x and if you integrate 2x you get x^2.

This is how I always do these problems, it also works if you have to integrate something like , if you differentiate you'll get something in a similar form.

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