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tan^(-1)(-1)=-tan^(-1)(1)...

`tan^(-1)(-1)=-tan^(-1)(1)`

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tan^(-1)(1/(a-1))=tan^(-1)(1/x)+tan^(-1)((1)/(a^(2)-x+1))

4tan^(- 1)(1/5)=tan^(- 1)(1/70)-tan^(- 1)(1/99)+pi/4

Prove that tan^(-1)(1/70)-tan^(-1)(1/99)=tan^(-1)(1/239)

4tan^(- 1)(1/5)=tan^(- 1)(1/70)+tan^(- 1)(1/99)+pi/4

tan^(-1)(1/7)+tan^(-1)(1/9)+tan^(-1)(1/8)

Find the value of 4tan^(-1)(1/5)-tan^(-1)(1/70)+tan^(-1)(1/99)

Find the value of 4tan^(-1)(1/5)-tan^(-1)(1/(70))+tan^(-1)(1/(99))

Find the value of 4tan^(-1)(1)/(5)-tan^(-1)(1)/(70)+tan^(-1)(1)/(99)

Prove that tan^(-1)(1/70)-tan^(-1)(1/99)=tan^(-1)(1/239)

Prove that tan ^(-1)(1/5) + tan^(-1)(1/7) +tan^(-1)(1/3)+ tan ^(-1)(1/8) = pi/4