$\frac{dx}{dy}=\frac{-\left(x+x.\:\cos\:\left(x.y\right)\right)}{y+y.\cos\left(x.y\right)}$
$\left(9-m^2\right)^4$
$4m^{10}+5m^5+9+4m^{10}-5m^5-9$
$\lim_{x\to0}\left(\frac{\ln\left(1+x\right)}{x^2}\right)$
$\left(15+x\right)^2\left(15+x\right)$
$x^2+3x-72$
$2x-7>5$
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