Which of the statements are true?

Question

If cos(θ) = 1/2, then which of the following statements must be true? Choose all that apply.

1.) cos(-θ)=1/2

2.) sin(pi/2 -θ)= 1/2

3.) sec(θ) = 2

4.) tan^2(θ) =3

Answer 1

cos (-θ) = cos θ

sin ((π/2) - θ) = cos θ

sec θ = 1 / cos θ

tan² θ = sec² θ - 1

Answer 2

theta equals 60 degree

1.) cos(-θ)=1/2 true

2.) sin(pi/2 -θ)= 1/2 true

3.) sec(θ) = 2 true

4.) tan^2(θ) =3 true