Question

cos -(π/12) cos (π/12) -sin -(π/12) sin (π/12)​

Answer 1

Answer:

arccos(3/5) means "the angle in the first quadrant whose cosine is 3/5". So we draw a triangle in the first quadrant. Since cosine = adj/hyp = x/r we make the adjacent side, x, the same as the numerator of 3/5, which is x=3 and make the hypotenuse, r, the denominator of 3/5 which is r=5.