$0.5x=25$
$\cos\left(2x\right)-\sin^2\left(x\right)=\cos^2\left(x\right)$
$3xa^2\:-\:4a^2x\:+\:10xa^2$
$t\frac{11}{t^2}$
$3xy'+y=12x$
$\left(-4ab\right)\left(b\right)$
$x^2-2-1$
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