$\left(9a+b\right)^3$
$\sin\left(x\right)+\sin\left(3x\right)+\sin\left(2x\right)$
$-7x+15\le-5x+1$
$\sin\left(x\right)\cdot\sin\left(2x\right)+\sin^2\left(x\right)=0$
$\left(-2xy^2+9xy^3\right)\left(-2xy^2+9xy^3\right)$
$\frac{4a^3-5a}{2a-1}$
$64a^3+1$
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