$3x^2+8x+3=0$
$\left(x^{\frac{2}{3}}\right)^2\sqrt[3]{x^2}=x^a$
$\lim_{x\to\infty}\left(\frac{x^3}{x-tanx}\right)$
$\lim_{x\to0}\left(\frac{sinx-x}{1-cosx}\right)$
$-5\left(3^0-5^2+1^6\right)^3+20^1$
$\left(-6\right)\cdot\left(+8\right)$
$\frac{sen7a}{sena}-2cos2a-2cos4a-2cos6a$
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