$687\cdot5.12$
$\cos\left(a\right)\cdot\csc\left(a\right)=\cot\left(a\right)$
$7^4-6$
$\left(x^4+3y^2\right)^3$
$x'\:+\:5x^2\:=\:25$
$\left(5u+3\right)\left(5u-3\right)$
$x^3-3x^2+3x-x$
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