Trig identity proofs: sin(A+B) = sinAcosB + cosAsinB

2,208 views · Published 2 December 2014 · 18:43 · Indexed 12 November 2026

Channel: Magic Monk · 2014 · Education

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In this video I present this proof in the smallest steps possible. All you need to know to understand this are the basic trig rules sin(theta)=opposite/hypotenuse etc.

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