Simplify the expression by using a sum or difference identity.
-sin(18°) cos (-4°) - cos(18°) sin (-4°)
A) cos 22°
B) sin 22°
C) cos 14°
D) sin 14°

Name: Simplify the expression by using a sum or difference identity. -sin(18°) cos (-4°) - cos(18°) sin (-4°) A) cos 22° B) sin 22° C) cos 14° D) sin 14°
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Question

Quizplus · Accepted Answer

The expression sin(18°) cos(-4°) - cos(18°) sin(-4°) is equivalent to the sine of the sum of two angles, which is sin(18° + 4°) = sin(22°).

Simplify the Expression by Using a Sum or Difference Identity