$\frac{1+cosec\left(u\right)}{sec\left(u\right)}-ctg\left(u\right)=cos\left(u\right)$
$2x+7y-5x-2y-y+5x-y$
$x^2+1\cos5$
$8x^2-2x=0$
$2x^3\:0-9x^2\:+12x\:-2$
$\left(-8\right)\cdot\left(+2\right)-\left(+4\right)-\left[\left(-5\right)+\left(+2\right)\right]$
$46-\left[38-\left(-2\right)+-9+\left(42-10-15\right)-\left(-7\right)\right]$
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