Use the appropriate sum or difference identity to write the given expression as a function of x alone.
-sin (180° + x)
A) cos x
B) sin x
C) - sin x
D) - cos x

Question

Quizplus · Accepted Answer

The sum identity for sine, sin(α + β), when applied to sin(180° + x), simplifies to sin(180°)cos(x) + cos(180°)sin(x). Since sin(180°) = 0 and cos(180°) = -1, the expression simplifies to -sin(x).

Use the Appropriate Sum or Difference Identity to Write the Given