$2\sec^2\left(x\right)-1=\frac{1+\sin^2\left(x\right)}{\cos^2\left(x\right)}$
$\:b^2+2\left(2-c\right)b+\left(4-4c+c^2\right)$
$a^{\frac{1}{3}}-2+a^{-\frac{1}{3}}$
$ab-2a-5b+10$
$-\left(-12-\left(-5\right)\right)+\left(4-12+\left(-2\right)\right)+1$
$\frac{9}{3}y^3+\frac{9}{2}xz+\frac{6}{3}xy^2z-\frac{4}{3}xy^2z-\frac{4}{2}y^3-7xz-\frac{3}{4}y^3$
$sin\left(x\right)csc\left(\frac{\pi}{x}-x\right)$
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