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Tan (AB) = (TanATanB)/ (1TanATanB) Proof Watch later Share Copy link Info Shopping Tap to unmute If playback doesn't begin shortly, try restarting your device Up NextProve\\cot(2x)=\frac{1\tan^2(x)}{2\tan(x)} prove\\csc(2x)=\frac{\sec(x)}{2\sin(x)} trigonometrycalculator en Related Symbolab blog posts Spinning The Unit Circle (Evaluating Trig Functions ) If you've ever taken a ferris wheel ride then you know about periodic motion, you go up and down over and overTan(AB) = tanAtanB 1−tanAtanB (16) We can get the identity for tan(A − B) by replacing B in (16) by −B and noting that tangent is an odd function tan(A−B) = tanA−tanB 1tanAtanB (17) 8 Summary There are many other identities that can be generated this way In fact, the derivations Trigonometry Proof Of Tan A B Tan A B Tan A B C Formulae 33 Youtube Tan a bear hide