$\frac{dx}{dy}=\frac{\left(1+2y^2\right)}{y\:senx}$
$\frac{15x^2+43x+34}{3x+5}$
$6sec^3\left(x\right)-6sec^2\left(x\right)-6sec\left(x\right)+6$
$t^2-6t+13$
$\left(0.51+1.93y\right)+\left(2+y\right)$
$\lim_{x\to-1}\left(\frac{\sqrt{2x+3}-1}{x^5+1}\right)$
$x-2>10$
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