## lovekblue Group Title To integral tan^2 x, is it possible to change it to in terms of sin and cos and solve ? one year ago one year ago

1. lovekblue Group Title

opps nvm, just realize i got the same answer with using 1 + tan^x = sec^2x

2. lovekblue Group Title

i mean tan^2 x

3. mukushla Group Title

how about writing it like$\tan^2 x=1+\tan^2 x-1$and using the fact that $\frac{d}{dx}(\tan x)=1+\tan^2 x$

4. mukushla Group Title

ahh yes :)