$\frac{\left(1+cot\left(t\right)\right)}{1+tan\left(t\right)}$
$7^2-2\left(7-3\right)^2$
$\int y\sqrt{4y+2}dy$
$\left(x+1\right)^2sin^2x+\left(x-1\right)^2cos^2x$
$4=-5+y$
$\lim_{x\to\infty}\left(\frac{e^{2x}}{1+e^x}\right)$
$\frac{a^2-1}{a+1}$
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