$\left|12-\left(-4\right)\right|-\left|5-\left(+12\right)\right|$
$\frac{cos\theta\:}{1+sin\theta\:}-\frac{1}{cos\theta\:}=-tan\theta\:$
$\arccos\left(0.7071067811865476\right)$
$tan\:\left(45+a\right)=\:sec2a\:+\:tan2a$
$\frac{7x}{3}-17mn$
$682-24-39$
$\frac{c^6+2c^3-24}{c^4-4c^3+6c-24}$
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