$5cos^2\left(x\right)-sin^2\left(x\right)$
$y\cdot\frac{dy}{dx}=4x^6+2x^2+5$
$16x^4-36y^2$
$\cos\:\left(a^3+x^3\right)$
$4m^2+4m+17$
$\left(-6\right)\cdot\left(+8\right)$
$\left(2x-3\right)\cdot\left(4x+2\right)$
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