$30y-12$
$\sin^2\left(a\right)+\sin^2\left(a\right).\tan^2\left(a\right)=\tan^2\left(a\right)$
$4z+7>2z-7$
$4s^2-24s+37$
$50\cdot7.5$
$8 x ^ { 2 } + 2 x ^ { 2 } + 7 x$
$\frac{x^4-9x^2-x+2}{x^2+9}$
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