A. (2, 5/2)
B. [5/2]
C. (9/4, π+9/4)
D. (9/4, π+9/4)
If tan (cot x) = cot (tan x), then sin 2x=
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If the roots of a(b-c)x2+b(c-a)x+c(a-b)=0 are equal,then a,b,c are in
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