$15ab\:-\:5ay\:-\:3bx\:+\:xy$
$17\cdot17\cdot17$
$5k-10k$
$\frac{4x+2}{x+4}+\frac{3}{x}=\frac{21}{x^2+4x}$
$31-1$
$\cos^2\left(x\right)-\sin^2\left(x\right)=\cos2\left(x\right)$
$\frac{\sin\:\left(2x\right)+2\cos\left(x\right)}{1+\sin\left(x\right)}$
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