1.

Statement-I: If x cos theta = y cos(120^(@) + theta) = zcos(theta + 240^(@)), then xy + yz + xz=0 Statement II: If cosalpha + cos(120^(@) + alpha) + cos(120^(@)-alpha)=0 Then which of the above statements is/are correct ?

Answer»

Only I
Only II
Both I and II
Neither I nor II

Answer :C


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