$16\sec=1+9\sec$
$\sin\left(2x\right)-\cot\left(x\right)=-\cot x\cos\left(2x\right)$
$\left(\frac{1}{2}\right)^0x\left(\frac{1}{2}\right)^{10}$
$-48-16y$
$ydy=xdx$
$-1-x\left(x-1\right)$
$-4+\frac{\left(-20\right)}{\left(-4\right)}$
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