$f\left(x\right)=\ln\sec x$
$2\sin\left(x\right)\cos\left(x\right)\sec\left(2x\right)$
$12xy+3x^2y$
$\frac{7}{2x-8}=\frac{3}{x-6}$
$\left(3c-2a\right)^2$
$400-400\cdot 2.7183$
$\left(15a^2b-3\right)+\left(-8a^2b^2+7b-5\right)$
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