$2cos2x=sin2xcotx-2sin^2x$
$sin4x=0$
$-4x\left(6x-7\right)$
$\left(5x^2y^2+2\right)\left(5x^2y^2+7\right)$
$\:-78\:x\:22\:$
$cos\left(x\right)+cos\left(x+t\right)$
$4x^4+16x^2+16$
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