$4x^2=81$
$1-2\sin^2\left(4x\right)$
$\int\frac{4\text{sen}3x}{3e^{2x}}dx$
$\lim_{x\to0}\left(\frac{1}{x^2}-\frac{1}{\sin\left(x\right)}\right)$
$\lim_{x\to0}\left(x^2-5x\right)^{\frac{1}{x}}$
$\left(7a^3y^4+6m^3x^6\right)^2$
$12abc-30ac$
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