Calculus question

Question

Simplify: cos (30 – θ) – cos (30 + θ) .

a. sin θ

b. √3 sin θ

c. -sin θ

d. -√3 sin θ

Answer 1

cos 30 cos θ + sin 30 sin θ

cos 30 cos θ - sin 30 sin θ

Subtract bottom from top

2 sin 30 sin θ

sin θ

Not in list.