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If 2cosx=z1+1/z1 2cosy=z2+1/z2 2cosz=z3+1/z3 prove z1z2z3=1/z1.1/z2.1/z3?

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  • If 2cosx=z1+1/z1 2cosy=z2+1/z2 2cosz=z3+1/z3 prove z1z2z3=1/z1.1/z2.1/z3?


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