$\frac{1}{1+\cos\left(x\right)}-\frac{1}{1-cos\left(x\right)}$
$\left(x+8\right)\left(x-6\right)<0$
$2b^2\left(2a-3b\right)$
$\left(x+7\right)^2=x^2+14x+49$
$x\cdot12\ge17$
$20x^2-10b^2-30c^2$
$792.58+83.26$
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