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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §1.5 A Review of Trigonometry, #18 · Trigonometry · Identities

Find all angles … and … between 0 and … where

Find all angles $s$ and $t$ between 0 and $2 π$ where $sin (s + t) = sin s + sin t$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §1.5 A Review of Trigonometry, #18

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