$\left(33xz\right)\left(12x^2y^3z+13xy\right)$
$\sin\left(\sin^2-\cos^2\right)$
$\frac{d}{dx}9x^6+2x^4=7y+4x$
$\lim_{x\to3}\frac{x^3+9x}{x^2-3x}$
$\left(-7-x^4\right)^2$
$3\cdot40-15$
$cos^4x-sin^4x=1-2sin^2x$
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