$\left(x+1\right)\left(x-1\right)>\left(x-2\right)^{\left(2\right)}-3$
$-9x+4=-23$
$7x\cdot7x$
$\sec\left(-u\right)$
$\lim_{x\to-0.1}\left(\frac{sen\:2x}{4x}\right)$
$-6b^3+8a^3+4b^3-a^3$
$\frac{3x^4-2x^2+8x+3}{x+1}+2x^2+4x-1$
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