$-\cos\left(x\right)=-2\cos\left(x\right)+1-\sin\left(x\right)$
$\frac{x^2-169}{x-13}$
$\int7sin\left(7x\right)dx$
$15\cdot\left(-9\right)$
$x-2xy+x^2y+y=0$
$\sqrt{100a^2}$
$-4+5v=26$
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