Trigonometric Identity: tan(x +/- y): Proof

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  • matheasysolutions reply I don’t always derive trig identities but when I do I usually use the “+/-“ notation to save time deriving 😉 View Video Notes on Steemit: https://steemit.com/mathematics/@mes/video-notes-trigonometric-identity-tan-x-y-proof #GetOnSteem
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