$\left(x^2+x\:0.3\right)\left(x^2-0.5\right)$
$0.146\:=\:tan\left(\frac{x}{2}\right)$
$36a^2b^6-c^4$
$\frac{\left(cot\left(30\right)-tan\left(30\right)\right)}{\left(csc\left(120\right)+cot\left(120\right)\right)}$
$\csc^2a\tan^2a-1=\tan^2a$
$\lim_{x\to0}\:\left(\frac{sen\:20x}{sen\:2x}\right)$
$x^2-10+90$
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