$2x^2-x-13=2$
$\frac{\sin\left(x\right)}{\sec\left(x\right)+1}+\frac{\sin\left(x\right)}{\sec\left(x\right)-1}$
$8\cos^2x=5$
$\int\frac{\left(x+3\right)}{\left(x^3+x\right)}dx$
$v^2+14v+49$
$-4x\:si\:x=-2$
$\frac{8x^2+20x^3}{4x^2}$
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