$\frac{\frac{\cos\left(x\right)-2\sin\left(x\right)\sin\left(x\right)\cos\left(x\right)}{2\cos\left(x\right)^2\sin\left(x\right)}}{\cos\left(x\right)}$
$a:\:\sqrt{1}9+\:\sqrt{4}9$
$8+x^2-11$
$\frac{\left(x^2+5x\right)}{x^2+5}$
$-7+6a^2-10a$
$\left(2x^2\cdot10x\right)-48x$
$3\cdot tg^2x\cdot sec^2x$
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