$\frac{\sec\left(\frac{x}{2}\right)}{\csc\left(\frac{x}{2}\right)}$
$sec\:a\:-\:sin\:a\cdot\:tan\:a$
$5x+x+7\left(2x\right)$
$\int\sinh\left(4x\right)dx$
$\int\:\left(8x^2-3x+1\right)sen\left(x\right)dx$
$\frac{dy}{dx}=x^2e^{\left(-x^3+y\right)}$
$\left(7x+x^4\right)^2$
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