Question

2cos 70sin 50=sinA - sinB, then values of A & B are:
(a) A=120 and B=20
(b) A=60 and B=10
(c) A=20 and B=120
(d) A=10 and B=60

Answer 1

Answer:

Lhs=2 cos( 90°-50°). sin ( 90°-70°)

2con (40°) sin(20°)

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