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if angel A angel B angel C =180 then show that sin(B+C)sinA

Suraj 30th Nov, 2019

Answer (1)

Malini S N 30th Nov, 2019

A+B+C=180

B+C=180-A

sin(B+C)=sin(180-A)=sinA (As,sin(180- θ)=sin θ)

So,sin(B+C) = sinA

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