(sinx)^(1/2)=cosx

Question

x is between 0 and 90
What is sinx

Answer 1

sinx = cos^2x
sinx = 1-sin^2x
sin^2x + sinx - 1 = 0

now solve for sinx, and pick the positive solution.

Answer 2

Hey, one of my favourite numbers.
sinx = .618033989..
which is the decimal part of the Golden Ratio !
Neat!

Answer 3

the nice thing about Ø is that

Ø-1 = 1/Ø