Question

In order to verify the equation sin (θ +π/4) =-cosθ. What value would you need to know besides sin (π/4)?

Group of answer choices

a cos (π/4)

b sin (2π/3)

c tan (2π/3)

d cos ((-π)/3)

Answer 1

Answer: A cos (π/4)

I just took a test with this question and got it right