$12.65\cdot1$
$sinx\:\left(1-2cos^{2\:}x+cos^4x\right)$
$-\:6e\:-\:5\:-\:7e\:-\:3$
$x=y^2+3$
$\int\frac{2x}{\sqrt{x-5}}dx$
$cos\left(2x\right)sec^2\left(x\right)+2tan^2\left(x\right)$
$4t=t^2+11t$
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