$\frac{cos\:x}{sin\:x}+\frac{sin\:x}{cos\:x}$
$\frac{x^4+625}{x+5}$
$z^{-2}$
$\int\frac{1}{5x-2}dx$
$\frac{6}{sin30}=\frac{x}{sin45}$
$3x^2y-4x^3y-8x^2y^2$
$b-26=-53$
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