240 Followers Problem - 1

Geometry Level 3

cosθ1+cosθ2+cosθ3\large \cos \theta _{1} + \cos \theta _{2} + \cos \theta_{3}

Given that cos(θ1θ2)+cos(θ2θ3)+cos(θ3θ1)=32\cos \left( \theta_{1} -\theta_{2} \right) + \cos \left( \theta_{2} -\theta_{3} \right) + \cos \left( \theta_{3} -\theta_{1} \right) = -\dfrac{3}{2} , find the value of the expression above.

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