$\left(7x^2-2x\right)^2$
$\frac{x^2-9x}{x^2-7x-18}$
$\frac{2x}{xy}$
$\left(8-6v\right)^2$
$\frac{cos\left(x\right)+cos\left(x\right)sin\left(x\right)-cos\left(x\right)+cos\left(x\right)sin\left(x\right)}{cos^2\left(x\right)}$
$10^3\cdot10d^{15}$
$-3\sin x=-2,7$
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