How can I find the angle by the sin, cos, and tan without using the calclator?
64268
How does a calculator calculate the sine, cosine, tangent using just a number?
77978
Show that $\frac {\sin x} {\cos 3x} + \frac {\sin 3x} {\cos 9x} + \frac {\sin 9x} {\cos 27x} = \frac 12 (\tan 27x - \tan x)$
12741
How to prove that: $\tan(3\pi/11) + 4\sin(2\pi/11) = \sqrt{11}$
104427
Sines and cosines of angles in arithmetic progression
7795
Find the inverse of a Trig Matrix
12841
Ratio of sines given, find ratio of cosines?
24656
Proving that $\frac{\csc\theta}{\cot\theta}-\frac{\cot\theta}{\csc\theta}=\tan\theta\sin\theta$
5642
Geometry with Trigonometry
31448
Calculate $\int\left( \sqrt{\tan x}+\sqrt{\cot x}\right)dx$
617
Find θ: $β=\arctan\frac{(R+r)·\sin(θ)-r·\sin(θ(1+\frac{R}{r}))}{(R+r)·\cos(θ)-r·\cos(θ(1+\frac{R}{r}))}$
120797
Trigonometry question finding the sin and tan
104384
Trigonometric identity: $\frac {\tan\theta}{1-\cot\theta}+\frac {\cot\theta}{1-\tan\theta} =1+\sec\theta\cdot\csc\theta$
75570
Easy way of memorizing values of sine, cosine, and tangent
61591
Solve simple trig equation
26759
How do I find the angle between two vectors?
111815
Determine angle $x$ using only elementary geometry
139153
How do you find a vector in the form  when only the angle and magnitude are given?