$687\cdot7$
$\left(x^2+2x+4\right)\left(x^2-2x+4\right)$
$x^2+3x-72=0$
$\left(3s^5+8t^{12}\right)\left(3s^5-8t^{12}\right)$
$\sin\left(8\right)=\sin\left(4\right)\cos\left(4\right)$
$3\:+\:8g^2\:-\:5g^2\:+\:4g$
$\frac{a^2-w^2}{a-w}$
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