$\sec\left(\theta\right)-cos\left(\theta\right)=tan\left(\theta\right)sin\left(\theta\right)$
$\left(3x^y-5y^x\right)\left(3x^y+5y^x\right)$
$9h^{4\:}-7+2-8h^3+4h^4$
$\lim_{n\to0}\left(\left(\frac{n}{2}\right)\left(\frac{\left(1-e^{-\frac{2}{n}}\right)}{2}\right)\right)$
$\frac{d^{21}}{dx^{21}}\left(2\cos\left(x\right)-3\sin\left(x\right)\right)$
$9\sec\left(x\right)^2-48\sec\left(x\right)+64$
$\frac{\sin\left(x\right)+\cot\left(x\right)\left(1+\cos\left(x\right)\right)}{1+\cos\left(x\right)}=\csc\left(x\right)$
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