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2tan^-1 (1/3) + tan^-1 (1/7) = (a) tan^-1 (44/29) (b) π/2 (c) 0 (d) π/4

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2tan-1 (1/3) + tan-1 (1/7) = 

(a) tan-1 (44/29)

(b) π/2

(c) 0

(d) π/4

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Answer is (d) π/4

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