$\frac{\sec x-\cos x}{\tan^2x}$
$\left(2y^2\right)\left(4xy^3\right)+\left(3xy^4\right)\left(5y\right)$
$\left(d^9\right)^5$
$\frac{dy}{dx}=\frac{x\sin\left(2x\right)}{y^2}$
$-9b^2+4b^2$
$\log_x\left(2x-1\right)=1$
$\sqrt{x-3+1}$
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