How to find the numerical value of $\tan20\tan40\tan60\tan80$?
103988
Prove that $\tan20^°\tan40^°\tan60^°\tan80^°=3$
122395
Integrating $\sec\theta\tan^2\theta d\,\theta$
154219
Help with integral $\int\frac{1}{\sqrt{\tan x}}dx$
2676
Finding $\frac {d(\tan \theta)}{d\theta}$
147113
How to solve $2 \tan x / (1 - (\tan x)^2) = (\sin 2x)^2$?
42391
Calculate $\tan9^{\circ}-\tan27^{\circ}-\tan63^{\circ}+\tan81^{\circ}$
31776
How to find $\lim_{x\to 0}\frac{\tan 3x}{\tan 5x}$?
27132
Can't figure out how $\sin\left(\tan^{-1}(x)\right)=\frac{x}{\sqrt {x^2+1}}$
59791
Determine the exact value of equations involving more two trig variables
133255
$\tan(z)=i$, no solution
61328
Resolve $\lim_{x \to 0} \frac {\tan 3x}{\tan 5x}$
108916
On the proof $\tan 70°-\tan 20° -2 \tan 40°=4\tan 10°$
68881
Solve for $\theta$: $a = b\tan\theta - \frac{c}{\cos\theta}$
47206
$-1 = 0$ by integration by parts of $\tan(x)$
71540
Real and Imaginary Parts of tan(z)
82170
Solve $x = \frac{1}{2}\tan(x)$
88925
How find this limit $\lim\limits_{x\to 0^{+}}\frac{\sin{(\tan{x})}-\tan{(\sin{x})}}{x^7}$