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In the proof of the sine rule, equating altitudes b sin γ and c sin β gives
Ab/sin β = c/sin γ
Bb sin β = c sin γ
Cb/sin γ = c/sin β
Db cos β = c cos γ
Answer & Solution
Correct answer: A. b/sin β = c/sin γ
Setting b sin γ = c sin β and dividing by sin β sin γ gives b/sin β = c/sin γ.
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