Let f(theta)=sin(theta)[sin(theta)+sin(3theta)], then the correct relationship is

Answers (1)

Solution:     f(	heta )=sin 	heta (4sin	heta -sin^3	heta )

                     f(	heta )=4sin^2	heta cos^2	heta ,

                Rightarrow    f(	heta )=sin^22	heta geq 0  for all real 	heta.

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