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There is a well-known trig identity to express this as the product of sin and cos. Is there a way to get sympy to apply this identity? simplify ... ... <看更多>

Lagrange's Trig identity is 1+cosθ+cos2θ+⋯+cosnθ=12+sin(2n+1)θ22sinθ2,(0<θ<2π). How can we prove this identity using series method and complex variables? I ... ... <看更多>