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cos x + cos y =1/3, sin x + sin y =1/4 then sin(x+y) a.25/7 b.24/25 cos x + cos y =1/3, sin x + sin y =1/4 then sin(x+y)a.25/7b.24/25
2 sin x+y/2 cos x-y/2 = 1/3&2 cos x+y/2 cos x-y/2 = ¼Now dividetan (x+y/2) = 4/3NowSin(x+y) = 2 tan (x+y/2) /1 + tan² (x+y/2)= (8/3) /(1 + 16/9)= 24/25
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