$tan\left(-x\right)sin\left(-x\right)$
$\frac{2\sin\left(60-a\right)}{cosa}$
$36x^2+60x+10$
$a^2-2ah+h^2$
$8\left(2y+4\right)-3\left(4y+6\right)$
$2b^2+3ab+4b+6a$
$\lim\:_{x\to\:\infty\:\:}\left(\frac{6x^3}{3x+2}\right)$
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