$\left(\sin x+\cos x\right)^2-\left(\sin x-\cos x\right)^2=n.\sin x.\cos x$
$\left(-7x^3+9x^2-3\right)\cdot\:\left(-2x^2-5x+6\right)$
$\frac{x^5}{x^7}$
$-3a+1\:\:con\:a\:=2$
$2x-3<x+4$
$\left(-8\right)\left(-8\right)\left(-3\right)$
$5^0\cdot5^2$
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