How many solution?

Geometry Level 3

4 c o s θ c o s 2 θ c o s 3 θ = 1 \large 4cos\theta cos2\theta cos3\theta=1

How many solution we get for θ \theta from this equation in 0 < θ < π 0<\theta<\pi ?


The answer is 6.

Md Mehedi Hasan by Md Mehedi Hasan , 22, Bangladesh

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