$x^{25}y^9-4x^2y^4$
$3\left(5x^5+7y^3\right)^2$
$\frac{dy}{dx}=-\frac{2xy}{1+x^2}$
$\left(x^{2a}+5y^a\right)^3$
$13n=39$
$1-cos5xcos3x-sin5xsin3x$
$2cos^2x\:+\:cosx$
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