$169-b^2$
$\frac{x}{-3}-11=-20$
$\left(\frac{-5}{1+x^2}\right)^2$
$2^{-3}+2^3$
$9\sin\left(x\right)\left(\csc\left(x\right)-\sin\left(x\right)\right)$
$x^6-216$
$\int\:\frac{-5}{\sec\left(x\right)-\cos\left(x\right)}dx$
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