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If cj >0 for i=1,2,....., n prove ...

If `c_j >0` for `i=1,2,....., n ` prove that `tan^(-1)((c_1x-y)/(c_1y+x))+tan^(-1)((c_2-c_1)/(1+c_2c_1))+tan^(-1)((c_3-c_2)/(1+c_3c_2))+.........+tan^(-1)1/(c_n)=tan^(-1)(x/y)`

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