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amstro
 2 years ago
If A, B and C are the angles of a triangle, prove that sinBcosC+cosBsinC=sinA
amstro
 2 years ago
If A, B and C are the angles of a triangle, prove that sinBcosC+cosBsinC=sinA

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Hope_nicole
 2 years ago
Best ResponseYou've already chosen the best response.0Plug in an angle for each

sauravshakya
 2 years ago
Best ResponseYou've already chosen the best response.2A+B+C=180 A+B=180C sin(A+B)=sin(180C) sinBcosC+cosBsinC=sinA

amstro
 2 years ago
Best ResponseYou've already chosen the best response.1@sauravshakya could you explain the step between sin(A+B)=sin(180C) sinBcosC+cosBsinC=sinA So sorry and thannks

sauravshakya
 2 years ago
Best ResponseYou've already chosen the best response.2Looks like I did a simple mistake, A+B+C=180 B+C=180A sin(B+C)=sin(180A) sinBcosC+cosBsinC=sinA
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