How to Solve Trigonometric Equations
https://brownmath.com/trig/trigsol.htm28.10.2020 · Summary:A trigonometric equationis one that involves one or more of the six functions sine, cosine, tangent, cotangent, secant, and cosecant. Some trigonometric equations, like x = cos x, can be solved only numerically, through successive approximations. But a great many can be solved analytically — in “closed form”, an