$\left|2\right|-\left|9-15\right|$
$\frac{1-e^{-5s}}{\left(s^4+16s^2\right)}$
$\cos\left(2x\right)+\sin\left(x\right)=4\sin^2\left(x\right)$
$\:2x\:+\:3y\:-\:7x\:+\:7x\:-\:8y\:+\:7x\:-\:2y\:+\:4y\:-\:5x\:-\:3x\:$
$-5^2-1$
$\left(-12\right).\left(-3\right).-1.5$
$\left(\frac{1}{6}x+\frac{2}{3}\right)^2$
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