$x^2-10x+90$
$3sec^2x\:-\:2tan^{2\:}x\:-\:4\:=\:0\:$
$\sqrt{14+1}$
$\frac{1}{x+1}+\frac{2x}{x^2-1}+\frac{1}{x-1}$
$\int2\tan\left(5\cdot\right)\sec\left(5\cdot\right)dx$
$\int5ay^2dy$
$\left(2x+1\right)\left(2x-3\right)-\left(2x-3\right)^2$
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