$81x^2-49a^4$
$4x+2y=10$
$\int\frac{\left(sin\right)^3}{1-cosx}\:dx$
$5.\left[-16:\left(21-13\right)-3\left(-7+15\right)\right]$
$y=5^{2-2x}-5$
$\lim_{x\to0}\left(x^2ln\left(x\right)\right)$
$\left(\frac{2}{x^6-1}\right)$
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