$x^3+5x^2-17x-21$
$f\left(4\right)=4\left(4\right)\frac{-10}{x-2}$
$9a^26+1,2a^23+0,04$
$x-9=4$
$\frac{\left(1-cos4x\right)^2}{\left(1+sen5x\right)^3}$
$-7y-10$
$\cos\left(x-\pi\right)=\cos\left(x\right)$
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