$7-\left\{25-\left[-3-\left(-6-8\right)+7\right]+\left[-1-\left(3-4\cdot8\right)-16\right]\right\}$

$\frac{\frac{1}{\cos\:\left(x\right)}}{\frac{\cos\:\left(x\right)\sin\:\left(x\right)}{1}}$

$\left(1+\frac{sinx}{cosx}\right)\left(\frac{sinx}{cosx}\right)$

$\int_0^{\pi}x\sin^2\left(x^2\right)dx$

$13a+20b-19+18b-26a$

$\lim_{x\to\infty}\left(cos\left(\frac{6}{x}\right)\right)^{\left(x^2\right)}$

$\csc\left(72\right)+\csc^2\left(72\right)$