Sin q1 + sin q1+ sin q3=3 then cos q1 + cos q2 + cos q3 =
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Value of sine ratio ranges from\xa0−1\xa0to\xa01\xa0i.e.\xa0[−1,1]Now as\xa0sinθ1+sinθ2+sinθ3=3We must have each of them as\xa01and hence\xa0θ1=θ2=θ3=90∘and as\xa0cos90∘=0cosθ1+cosθ2+cosθ3=0