$\frac{cotx^2}{cosx^2}=\frac{1}{sinx^2}$
$10x+3y+z-5x-2y-5z$
$1-\cos2\cdot\csc2=1$
$\int\frac{3x-2}{2x^2+4x-6}dx$
$7\left(7-8x\right)-\left(4+5x\right)$
$\int\frac{3x-1}{x^2+4x+8}dx$
$18x^3-15x+12x^2-10$
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