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My main problem with trigonometry are the formulas dealing with relations btw. various trig. ratios (specifically, trig. ratios of sum & difference of angles). I can learn them by heart, but no matter how much I think about them, I can't understand them conceptually. Even the proofs that use the distance formula for two points on the unit circle don't seem to help with my understanding.

So, the question is, does anyone know of a trigonometric text where everything follows logically and is hard to understand (hard to understand, because it would use concepts necessary to understand the matter clearly)?

Thank You.