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[" 15."quad 4tan^(-1)(1)/(5)-tan^(-1)(1)...

[" 15."quad 4tan^(-1)(1)/(5)-tan^(-1)(1)/(70)+tan^(-1)(1)/(99)bar(cot)=(1)/(8)],[[" (a) "pi/4," (b) "pi/2],[" (c) "pi," (d) "oo]]

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

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

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

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

2tan^(-1)((1)/(5))+tan^(-1)((1)/(8))= tan^(-1)((4)/(7))

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

tan^(-1)((1)/(5))+tan^(-1)((1)/(7))+tan^(-1)((1)/(3))+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)