$\frac{1}{sin\left(x\right)sec\left(-x\right)}$
$4x-2y+x+3y+z$
$x^2<1$
$\frac{\left(-12\right)}{\left(-2\right)}$
$\sqrt{\frac{x}{2}}-\sqrt{\frac{1}{2x}}-\sqrt{\frac{2}{x}}$
$x\:+\:5\:\ge15$
$0.51u+0.59+u$
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