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If cos^4x+sin^4x-sin2x+3/4sin^2 2x=y (a...

If `cos^4x+sin^4x-sin2x+3/4sin^2 2x=y` (a) y=1 if x=`(15pi)/2` `(b) y!=0` for any value of x` (c) `y=0 if `x=15pi` (d) `y=1 if sin2x=0`

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