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Homework Statement
problem 1
diff([f(tanx)], x) = x^2; prove that diff[f(u)]=(tan^-1(u))^2/(1+u^2)
problem 2
int(f(u), u = 0 .. 1) = f(t)-1; prove that f(a+b)=f(a)f(b) for every a,b ∈R
The Attempt at a Solution
problem 1
i don't know how to answer this question... taking the integral of f'(tan x) =x^3/3+C doesn't seem to help...
problem 2
the function seems to be the exp function where it's itself its derivative and e^0=1. but is it correct to state that the function is the exponential function directly?
btw,i'm right now learning the technique of integration.