How to find out the value of $\tan(25°)$ without a calculator?
56151
Mental estimate for tangent of an angle (from $0$ to $90$ degrees)
82286
Derivation of asymptotic solution of $\tan(x) = x$.
122395
Integrating $\sec\theta\tan^2\theta d\,\theta$
64268
How does a calculator calculate the sine, cosine, tangent using just a number?
81057
Evaluation of $\int_{\frac{1}{e}}^{\tan x}\frac{t}{1+t^2}dt+\int_{\frac{1}{e}}^{\cot x}\frac{1}{t(1+t^2)}dt$
4326
How to calculate temperature in Wire?
81727
How can I find the following product? $ \tan 20^\circ \cdot \tan 40^\circ \cdot \tan 80^\circ.$
67034
Find the value of $\alpha + \beta + \alpha\beta$ from the given data
67710
Determine the smallest positive value of x(in degrees) for which: $\tan(x+100^{\circ}) = \tan(x+50^{\circ})\tan (x)\tan(x-50^{\circ})$
64497
prove that $\tan(\alpha+\beta) = 2ac/(a^2-c^2)$
17168
Find the value of $\sin\frac{2\pi}{7}+\sin\frac{4\pi}{7}+\sin\frac{8\pi}{7}$
142673
Evaluate $\tan^{2}(20^{\circ}) + \tan^{2}(40^{\circ}) + \tan^{2}(80^{\circ})$
49443
What is the value of $\arctan(1/2)+\arctan(1/5)+\arctan(1/8)$?
85872
Prove $1 + \tan^2\theta = \sec^2\theta$
122913
Evaluate $\int \frac{\sec^{2}{x}}{(\sec{x} + \tan{x})^{5/2}} \ \mathrm dx$
147113
How to solve $2 \tan x / (1 - (\tan x)^2) = (\sin 2x)^2$?
48956
Simplify $\arctan (\frac{1}{2}\tan (2A)) + \arctan (\cot (A)) + \arctan (\cot ^{3}(A)) $