$7,xy^{\prime}=4x$
$2^3\cdot2^4\cdot2$
$\frac{1-\sin^4x}{\cos^2x}$
$12x^2-86x-7$
$\left(5x^3-\:7xy^5\right)^2$
$\left(3a^3+4b^2\right)^2$
$\left(3\right)\left(-23\right)$
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