Question

evaluate the expression without using a calculator.
(cos 30)^2 - (sin 30)^2

Answer 1

is 30 in radians or degrees

Answer 2

degress

Answer 3

degrees

Answer 4

use double angle formulas\[\cos (30)^2-\sin(30)^2=\cos(2*30)=\cos(60)=0.5\]

Answer 5

does that help

Answer 6

yes