$\sec^2\left(x-1\right)\cos^2\left(x\right)$
$1-8a^3b^3$
$\left(7\right)^2\cdot7\cdot\left(7\right)^2$
$\left(2.03\right)^6$
$\lim_{x\to5}\left(\frac{x^2-5}{x^2-10x+25}\right)$
$345,76-54,976$
$\frac{sin\left(-t\right)}{cot\left(-t\right)}$
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