Question

If cos x = .34, what is sin x?

Answer 1

Use the formula:
$\sin^2 x + \cos^2 x = 1$
$\sin^2 x + (0.34)^2 = 1$
$\sin^2 x = 1-0.34^2 = 0.8844$
$\sin x =\pm 0.9404$