$\frac{cos\:x\:}{1-\:sen\:x}$
$cos\left(a-b\right)-cos\left(a+b\right)=2sinasinb$
$10-\left(-8-2\right)$
$9e^{3}y^{3}\left(3$
$\lim_{x\to5}\sqrt{y+2}$
$\frac{1+\sec\left(a\right)}{\sec\left(a\right)}$
$\int\left(x+2\right)^2\left(3-x\right)^7dx$
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