(cos4 A - sinn4 A ) =
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cos 4A i think so..................
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Answer:
Cos 4A-sin4A
=cos(2.2A)-sin(2.2A)
=(2cos²2A-1)-(1-2sin²2A)
=2cos²2A-1-1+2sin²2A
=2(sin²2A+cos²2A)-2
=2-2 [∵,sin²Ф+cos²Ф=1]
=0
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