$\cos\left(x\right)^2=\frac{\cos\left(x\right)}{\sec\left(x\right)}$
$9a^2-27ab+9b^2$
$64x^4-128x^2y^2+64y^4$
$\left(x+3\right)\left(x-2\right)=24$
$\frac{\left(-1\right)^n}{n+1}\cdot x^{n-1}$
$\left(3x^2-4\right)\left(2r-7\right)$
$\frac{b^2-9b-x}{b^2}$
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