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Prove geometrically that cos(A + B) = cos Acos B - sin Asin B.

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asked Mar 29, 2019 in JEE by kratos

Prove geometrically that cos(A + B) = cos Acos B - sin Asin B.

waves
sound
oscillations
class-11
differentiation
jee
application of derivative
jee mains
class-12
differentiability
continuity

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1 Answer

+1 vote

answered Sep 2, 2020 by kratos

Best answer

∴ (i) becomes

sin (A + B) = cosA.sinB + sinA.cosB

∴ sin (A + B) = sinA cosB + cosA sinB

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