Cosx power4-cosx square equals to -1. Then sin 2x will be .............
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cos^4 -cos^2 = -1
cos^2(cos^2-1) = -1
we know that sin^2x+cos^2x = 1
(cos^2x)(-sin^2x)= -1
→ sin^2x = 1 / cos^2x
cos^2(cos^2-1) = -1
we know that sin^2x+cos^2x = 1
(cos^2x)(-sin^2x)= -1
→ sin^2x = 1 / cos^2x
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