$\lim_{x\to0}\left(\frac{ln\left(sen\left(2x\right)\right)}{ln\left(senx\right)}\right)$
$-5x^3+2x+\frac{-6}{x}+2$
$0.8a^2+9a-1.3a^2-4a$
$\left(x\right)\left(cos\right)\left(26x\right)$
$\int a\cos\left(x-b\right)dx$
$5\left(-2\right)^4+8\left(-2\right)^3-3\left(-2\right)+1$
$30-\left(-12\right)+15-\left(+25\right)$
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