$16a^2+72a-81$
$3\left(3x-2\right)=21$
$\left(3a+4\right)\left(3a-1\right)$
$\frac{sin\left(2x\right)}{sin\left(x\right)}=2$
$\left(x^3+y^3\right)\left(7x+2\right)$
$4.1+3.1+2.1+1.1+0.1+-0.9+-19+-2.9$
$4\cos\left(x\right)-3\cot\left(x\right)=0$
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