$cos\:\left(90^{\circ}\:+\:x\right)$
$\lim_{n\to\infty}\:\frac{2^{2n}\cdot2}{4^n-1}$
$\left(3x^2+3y^3\right)^4$
$\int8\left(1+\tan^2\left(a\right)\right)da$
$\frac { 5 } { x + 6 } = \frac { 5 } { x } + \frac { 5 } { 6 }$
$\cot\left(\frac{x}{2}\right)=3$
$\left(3y-2z\right)-\left(4y-3z\right)$
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