$y-xy=\cos\left(2x\right)$
$y=\left(\sqrt{x^2-4}\right)^{\cos\left(x\right)}$
$\csc\left(2x\right)^2+\cot\left(2x\right)\csc\left(2x\right)=\frac{1}{2}\csc\left(x\right)^2$
$\frac{1}{x+4}-\frac{1}{6}=\frac{1}{x+1}$
$99^2-1$
$\lim_{x\to0}\left(\frac{5-\left(cos\left(5x\right)-1\right)}{sin\left(7x\right)-7x}\right)$
$\left(7x^2+y\right)^2$
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