$\lim_{x\to0}\left(\frac{xy^2}{x^2+y^4}\right)$
$\left(4x+5b^4\right)^2$
$e-1.4$
$\int x\left(5x+6\right)^{15}dx$
$\left(1-\cos\left(x\right)\right)\left(1+\cos\left(x\right)\right)\left(1+\cot^2\left(x\right)\right)=1$
$4x^2-64^4$
$\lim_{x\to4}\left(\frac{\sin\left(3x\right)^2}{x^2cosx}\right)$
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