$\frac{x^2-2x+1}{x^2+1}$
$256\left(-13\right)\left(-2\right)$
$\int\frac{2x-26}{x^2+x-20}dx$
$\left(-2\cdot t-4\cdot m+y\right)^2$
$\left(5\right)\left(4^x\right)-32=5088$
$-\frac{360}{60}$
$\sec\left(a\right)+\tan\left(a\right)=\frac{1}{\sec\left(a\right)-\tan\left(a\right)}$
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