$\left(+2\right)-\left(-3\right)$
$\frac{dy}{dx}=x^2y=3$
$23.5\cdot23.7$
$-13\sec\left(x\right)+8=-18\sec\left(x\right)+18$
$2^x\infty2^3\infty2^1$
$\sin\left(20\right)\cot\left(20\right)=\cos\left(20\right)$
$4-\left(-2\right)+4$
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