$x^4+y^4;\:x=5;\:y=4$
$\lim_{x\to3}\left(\frac{9x+6x^2+x^3}{x^3-9x}\right)$
$\left(15m-13n\right)\left(15m+13n\right)$
$\int3^{10x+3}dx$
$\frac{2\sin\left(60-a\right)}{cosa}$
$\int7\:\ln\left(x\right)dx$
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