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If ci >0 for i=1,\ 2,\ ,\ n , prove th...

If `c_i >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))+\ dot+``tan^(-1)(1/(c_n))`=`tan^(-1)(x/y)```

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