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Simplification
What is the value of sin (90° + 2A)[4 – cos2(90° – 2A)]?
2(cos3 A – sin3 A)
2(cos3 A + sin3 A)
4(cos6 A+ sin6 A)
4(cos6 A – sin6 A)
Correct Answer:
4(cos6 A – sin6 A)
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