Question

if sin(theta)=-(3/8) and theta is in quadrant IV, then what is cos(theta)?

Answer 1

sin(x)^2 + cos(x)^2=1

then
you can find cos(theta) and because theta is in quadrant IV cos9theta) is positive

Answer 2

Use the Pythagorean Theorem to find x and then use cosine = side adjacent/hypotenuse to find the cosine.

Answer 3

is x =7.4?

Answer 4

Use exact value.