Simplify the expression by using a sum or difference identity.
-cos(14k) cos (2k) - sin(14k) sin (2k)
A) sin(16k)
B) cos(12k)
C) sin(12k)
D) cos(16k)

Name: Simplify the expression by using a sum or difference identity. -cos(14k) cos (2k) - sin(14k) sin (2k) A) sin(16k) B) cos(12k) C) sin(12k) D) cos(16k)
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Question

Quizplus · Accepted Answer

This expression can be simplified using the cosine sum identity, which is cos(A + B) = cos(A)cos(B) - sin(A)sin(B). Applying this to the given expression, we get cos(14k + 2k) = cos(16k).

Simplify the Expression by Using a Sum or Difference Identity