$\frac{\sec\left(x\right)}{\tan\left(x\right)+\cot\left(x\right)}\text{=}\sin\left(x\right)$
$285.1\cdot2001$
$4\left(a+5\right)\:-3\left(2\:+\:3a\right)$
$x-2^3$
$7a^2+2ab+5b+5a-2b$
$\left(e^x+e^{-x}\right)\frac{dx}{dy}=y^2$
$\frac{dy}{dx}=y^2\sqrt{4-x}$
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