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Q.

The number of positive integral solutions of the equation tan-1x+cot-1y=tan-13 is

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a

0

b

1

c

2

d

3

answer is C.

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Detailed Solution

tan-11y=tan-13-tan-1x=tan-13-x1+3x 1y=3-x1+3x    y=1+3(x-3)+93-x y=103-x-3    3-x=1, 2   x=2, 1  y=7, 2 no of sols=2

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