$2cot\left(2x\right)=cot\left(x\right)-tan\left(x\right)$
$\frac{a^7}{a^5}$
$1-8\cdot\cos x=0$
$\lim_{x\to\infty}\left(1+\frac{1}{x}\right)^{5x-2}$
$-2+3\:.\:350$
$6n^4\:-\:12n^2\:+\:6$
$-x^2-10x-8=0$
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