$f\left(x\right)=\frac{e^{x}+e^{-x}}{2}$
$\left(6x^2+3y^3\right)\left(6x^2-3y^3\right)$
$cos^8x-2cos^4x+1$
$cot\left(-\frac{\pi}{4}\right)-1$
$\left(x+4\right)^2-\left(x+7\right)^2$
$156\cdot16$
$2^2-2\cdot2\cdot3+4$
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