$\cos\left(x\right)\left(-\tan\left(x\right)^2\right)=\cos\left(x\right)\left(1-\sec^2\left(x\right)\right)$
$b+7=15$
$-\left(7.2b+8c\right)+6$
$y^{-2}y^3x^0x^{-2}$
$-x+2y-6x+10y$
$17-\left(-1\right)+\left(-5\right)$
$\lim_{x\to0}\left(\frac{sin\left(x^2\right)}{x\:sin\left(x\right)}\right)$
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