Sin^4A+cos^4A/1-2sin^2A×cos^2A
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Numerator =Sin^4 A + cos^4 A
=(sin^2 A + cos^2 A)^2 - 2sin^2A cos^2A
= 1 - 2sin^2 A cos^2 A .............. (1)
Denominator = 1 - 2sin^2 A cos^2 A.........(2)
Nr. /Dr. = (1) /(2) = 1
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