$\left(9a^3b-13a^2\right)^2$
$\frac{\sin^2x+1}{\cos x}+\cos\left(x\right)$
$cos\left(4x\right)=8cos^4x-8cos^2x+1$
$2x^2-2\left(x+5\right)-\left(x+3\right)^2+19$
$6\left(v+10\right)=30$
$5y^2-13y-6$
$2\left(x^2-2x\right)=5$
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