$\lim_{x\to0}\left(\frac{2senx\cdot\left(senx+b\right)}{x}\right)$
$3x^2-5x+8-x^2-6$
$\left(\frac{1}{2}x-\frac{5}{4}\right)^2$
$cot\left(x\right)+2=0$
$\sqrt{4a^4}8a^3b$
$\int\frac{24}{\left(6x-5\right)^5}dx$
$4\sin\left(x\right)cos\left(x\right)\left(1-2sin^2x\right)=sin\left(4x\right)$
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