$\left(-3\right)\left(-4\right)\left(-7\right)\left(3\right)$
$-18-\left(-21\right)$
$f8uf$
$-5^2\cdot\left(\frac{10}{5}\right)^2\cdot\left(10\right)^{-2}$
$\left(x-4\right)^2\ge6$
$7f^2-7f$
$\cos\left(8x\right)\cdot\cos\left(2x\right)-\sin\left(8x\right)\cdot\sin\left(2x\right)$
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