Question

If sin x = .42, what is cos x?

Answer 1

\[\sin ^{2}x+\cos ^{2}x=1\]

Answer 2

\[\cos ^{2}x=1-\sin ^{2}x\]

Answer 3

\[cosx=\sqrt{1-\sin^2}x\]

Answer 4

find the arc sin of x first or sin(-1)0.42

Answer 5

you get x = 24.8349

Answer 6

then find the cos of that so cos 24.8349

Answer 7

= 0.9075