Trigonometry, trigonometric functions, sin, cos, tan, cot
Trigonometry, trigonometric functions, sin,cos,tan,cot ... 1 + cos(2u) = 2 cos 2 (u) 1 - cos(2u) = 2 sin 2 (u) sin3β = 3sinβ - 4 sin 3 β cos3β = 4cos 3 β - 4 cosβ $\tan3\beta=\frac{3\tan\beta - \tan^3\beta}{1-3\tan^2\be...