$\int_7^9\left(arctan\left(\frac{7}{x}\right)\right)dx$
$6x^3-3x^2-12x-3$
$x^2=2y$
$1+\cot^2\cdot20=\csc2\cdot20$
$\frac{1}{\csc^2x}+\frac{\cos x}{\sec x}$
$w^2-16w+64$
$ax+b+2\left(b-ax\right)=3b-a^2$
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