$30+7.500$
$2\left(f-9\right)+2\left(-3f+9\right)$
$2^1\cdot2^2$
$\lim_{x\to0}\:cos\left(x^2+tanx\right)$
$sec^2xsinx$
$5x+9\le10$
$\frac{cot\left(cos+tan\cdot sen\right)}{cot\left(cos+sen\cdot tan\right)}$
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