$\frac{cos\left(x\right)+tan\left(x\right)}{sec\left(-x\right)}$
$\sqrt{b^2}$
$-\left(2a-b\right)$
$ax^3-8ay^3$
$-\left(5\right)-\left(-5\right)$
$7^2-2^2$
$y^2\sin xdx-3dy+5ydy=0$
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