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[" (vi) "2tan^(-1)(1)/(2)+tan^(-1)(1)/(7...

[" (vi) "2tan^(-1)(1)/(2)+tan^(-1)(1)/(7)=tan^(-1)(1)/(17)],[" (vii) "tan^(-1)1+tan^(-1)2+tan^(-1)3=pi=2(tan^(-1)1+tan^(-1)(1)/(2)+tan^(-1)(1)/(3))]

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2Tan^(-1)(1)/(3)+tan^(-1)((1)/(7))=

tan^(-1)2-tan^(-1)1=tan^(-1)((1)/(3))

Prove that: 2tan^(-1)(1)/(2)+tan^(-1)(1)/(7)=tan^(-1)(31)/(17)

Prove that: 2tan^(-1)(1)/(2)+tan^(-1)(1)/(7)=tan^(-1)(31)/(17)

tan(tan^(-1)((1)/(2))-tan^(-1)((1)/(3)))=

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

tan^(-1)2-tan^(-1)1=tan^(-1)(1/3)

Prove that: 2tan^(-1)(1/2)+tan^(-1)(1/7)=tan^(-1)(31/17)

2tan^(-1)((1)/(5))+tan^(-1)((1)/(7))+2tan^(-1)((1)/(8))=