$-10-a$
$\lim_{x\to8}\left(7x\right)$
$16x^2+40+25$
$-2\cos\left(\frac{x}{2}\right)^2=-1$
$\int_{-1}^2x^2\left(x^3+1\right)^{14}dx$
$cos\left(7y\right)dy=-sin\left(2x\right)dx$
$2cos2x+2cosx=0$
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