let v = sinθ
draw a right triangle, and at one angle θ, label the opposite side = v, and the hypotenuse = 1. so, sinθ = v.
Now, the other leg, adjacent to θ, is √(1-v^2).
cosθ = adjacent/hypotenuse = √(1-v^2)
Rewrite cos(arcsin(v)) as an algebraic expression in v.
i know that the answer is squroot of 1-v^2
but i don't know the process of how to come to this answer. Thanks for the help!
1 answer