$2 \int 5 x ^ { 4 } d x$
$-3b\:.\:20$
$\int\cos^2\left(x\right).\left(\sec\left(x\right)+\csc^2\left(x\right)\right)dx$
$\int\frac{1}{x^2-x-1}dx$
$cos2a+6cos^2a=1$
$3-4-2\cdot5-11-18$
$\lim_{x\to0}\left(\frac{3\arctanh\left(2x\right)-6}{4x^2}\right)$
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