Question

Prove that cos(sin^(-1)(x))=sqrt(1-x^2) for -1= 11 years ago

Answer 1

I think I got something....
If I take the derivative....it becomes
-sin(arcsin(x))(1-x^2)^-1/2=(-2x)(1-x^2)^-1/2

Answer 2

then -sin(arcsin(x)) cancels out to just be -x

Answer 3

ooooooh I left out a 1/2 on the right side of the = sign!!! That's where I messed up!!

Answer 4

I got it! Then the 1 over sqrt of (1-x^2) can cancel out and you're left with -x=-x which proves the theory

Answer 5

Thanks guys! :)

Answer 6

?

Answer 7

no one did anyhting

Answer 8

lol I could feel the support though! I could feel the love! xD