[" 21.Find "tan^(-1)+tan^(-1)2+tan^(-1)3...

[" 21.Find "tan^(-1)+tan^(-1)2+tan^(-1)3],[[" (a) "pi," (b) "(pi)/(2)," (c) "-pi," (d) "+(pi)/(3)]]

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

tan^(-1)1+tan^(-1)2+tan^(-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)

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

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

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

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

Find tan^(-1) tan ((2pi)/3)

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