$\frac{1+\tan y}{1+\cot y}=\tan y$
$-\cos^3\left(0\right)$
$z^2-4$
$\left(1+\:\frac{1}{sin\:x}\right)$
$\lim_{x\to1}\sqrt{x^2}-x+\left(x^2+4\right)^2$
$x-2\left(6x^3-2x^2+2x-4\right)$
$\lim_{x\to0}\left(2x\left(\ln\left(4x\right)\right)\right)$
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