prove that sin power 4 theta minus vis power 4 theta us equal to 2sin square theta minus 1
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Answer:
=(sin² theta)² - (cos² theta)²
=(sin² theta + cos² theta) (sin² theta - cos² theta)
= 1(sin² theta - cos² theta)
= 1(sin² theta - 1 + sin² theta)
= 1(2sin² theta - 1)
= 2sin² theta - 1
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