Let x be the side adjacent to the angle θ, with 0<θ<π/4, in a right triangle whose hypotenuse is 1. Whithout Trig. functions, express the following in terms of x.  a)Cosθ b)Cos(π/2-θ) c)Tan^2(θ)

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by Stealthgeek at February 27, 2011

d)Sin(2θ) e)Cos(4θ) f)Sin(Cos^-1(x))

Now i think i understand what the format they are looking for.

a) x=√(1-y) Help please.