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[" 63."4tan^(-1)(1)/(5)-tan^(-1)(1)/(70)...

[" 63."4tan^(-1)(1)/(5)-tan^(-1)(1)/(70)+tan^(-1)(1)/(99)" is equal to: "],[[" (A) "pi/6," (B) "(pi)/(4)," (C) "(pi)/(3)," (D) "(pi)/(2)]]

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tan^(-1)((1)/(4))+tan^(-1)((2)/(9)) is equal to

4tan^(-1)(1/5)-tan^(-1)(1/239)=

tan^(-1)((1)/(4))+tan^(-1)((2)/(9)) is equal to :

tan^(-1)((1)/(4))+tan^(-1)((2)/(9)) is equal to :

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

4 tan^(-1)(1/5)-tan^(-1)(1/239) is equal to

4tan^(-1)""(1)/(5)-tan^(-1)""(1)/(239)=