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Q.

If p<q<r<0 then Cot-1pq+1p-q=

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a

0

b

π

c

2π

d

π2

answer is C.

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Detailed Solution

p<q<r<0 tan-1p-q1+pq=tan-1p-q1+pq+tan-1q-r1+qr+tan-1r-p1+rp tan-1x-y1+xy=tan-1x-tan-1y, x-y>0π+tan-1x-tan-1, x-y<0 =π+tan-1p-tan-1q+π+tan-1q-tan-1r+tan-1r-tan-1p=2π

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