Q.293 : Δ ABC में a - b/ a + b = ?

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Q.293 : Δ ABC में a - b/ a + b = ?
(a) sin (A - B)/sin(A + B)
(b) cos (A - B)/cos(A + B)
(c) tan(A - B/2)/tan(A + B/2)
(d) इनमे से कोई नही

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Answer :tan(A - B/2)/tan(A + B/2)

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