$\frac{cos\:b}{1-sin\:b}=sec\:b+tan\:b$
$-25x\:+\:x\:-\:13d\:+\:5d\:-\:3n\:+\:2$
$a^6-b^{12}$
$x^2+26x+14$
$-7\cdot105$
$tan\left(\frac{45}{2}\right)$
$\frac{3y^4}{18y^2}$
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