$\cos\left(x-y\right)-\cos\left(x+y\right)=2\cdot\sin\left(x\right)\cdot\sin\left(y\right)$
$62x+41x^2y-8x$
$\left(r^2-v\right)\left(r^2+v\right)$
$\frac{x}{3}<4$
$-x\:=\:-7$
$\left(a+2x\right)^5$
$\left(a^{x+1}+9\right)+\left(a^{x+1}-8\right)$
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