$y^2\:-\:121\:$
$\int\frac{x^2+20x-7}{\left(x^2-1\right)\left(4x^2+9\right)}dx$
$-10w-15.5$
$3x+5x-9x+15x-25x-3x$
$\int_1^2\left(\tan\left(2+\sin\left(x\right)\right)\right)dx$
$\frac{n^2}{9}+mn^2+9m^2$
$15+\left|15\cdot4-3\cdot\left(7-3\right)\right|-9$
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