trig
posted by Emily .
cos(sin^1 x)=sq rt(1x^2)
prove the identity

draw a triangle with opposite leg=x, hypotenuse=1
adjacent leg = √(1x^2)
however, doing it algebraically,
let θ=sin^1 x
x = sinθ
cos^2 θ + sin^2 θ = 1
cos^2 θ + x^2 = 1
cos^2 θ = 1  x^2
cosθ = √(1x^2)
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