cos(n + 2)x cos(n + 4)x + sin(n + 2)x sin(n + 4)x is equal to
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Answer:
cos(-2)x
Step-by-step explanation:
= cos(n + 2)x cos(n + 4)x + sin(n + 2)x sin(n + 4)x
= cos(n+2-n-4)x {cos(A-B) = cosAcosB+sinAsinB }
= cos(-2)x
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