$\int_0^{\frac{\pi}{3}}\sqrt{1+\tan^2\left(x\right)}dx$

$\frac{\tan\left(x\right)-\tan\left(x\right)^2}{\sec\left(x\right)^2}$

$\frac{1}{cosx}\cdot\frac{sinx}{cosx}$

$x-6y=27$

$43x+27x-53+38x-23x+43-26x+14-19$

$\left(x^2+7y\right)^2$

$\lim_{x\to\frac{\pi}{2}}\left(sen\left(x\right)^{\left(\frac{1}{\left(x-\frac{\pi}{2}\right)}\right)}\right)$