Sin^4+cos^4=1-2sin^2×cos^2
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see carefully question you can take 2 sin squared 2x + cos 2xin left hand side then you can solve this question
sateeshbabu1974:
Please explain in detail
first of all you take minus 2 sin squared 2x cos squared 2x in taken left hand side then use see that this is the formula of sin square x is equal to 1 hence it is Pro ved
now you have any problem
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