Cos^4=1/8(cos4theta+4cos2theta+3)
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Answer:
Wrong question. Cos^4 of what???
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Answer:
-1
Step-by-step explanation:
Explanation: We need. (a+b)2=a2+2ab+b2. cos2x=2cos2x−1. cos4x=2cos2(2x)−1.
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