$\frac{-45-15}{-5}$
$9^{-4}\cdot9^{-4}\cdot9^6$
$18x-12y=9$
$\left(3x\cos\left(3x\right)+\sin\left(3x\right)-3\right)dx+\left(2y+5\right)dy$
$\frac{d^2}{dx^2}\left(\ln\cos\left(x\right)\right)$
$tan\left(a+\frac{\pi}{2}\right)=-ctg$
$x^2+16x-25$
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