$\lim_{x\to0}\left(\frac{x+sen2x}{x}\right)$
$3^{2x-1}=27$
$\left(6y+2\right)\left(r+s\right)$
$4a^2-b^2=0$
$f\left(x\right)=\frac{8x+4}{4x-5}$
$r^2-11r$
$\frac{\sec^2\left(30\right)}{\left(\sin\left(45\right)\left(\cos\left(45\right)\right)\right)}$
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