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Prove that the least positive value of x...

Prove that the least positive value of `x ,` satisfying `tanx=x+1,` lies in the interval `(pi/4,pi/2)`

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Let f(x) = tan x and g(x) = x + 1, which could be shown as follows.

From the above the figure, tan x = x + 1 has infinitely many solutions, but the least positive value of `x in ((pi)/(4), (pi)/(2)).`
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