1.

If `y=sin^(2)alpha+cos^(2)(alpha+beta)+2sinalphasinbetacos(alpha+beta)`, then `(d^(3)y)/(dalpha^(3))`, isA. `(sin^(3)(alpha+beta))/(cosalpha)`B. `cos(alpha+3beta)`C. 0D. none of these

Answer» Correct Answer - C


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