30. tan ^-1 x is not the same thing as 1/tan xtan^-1(x) is the inverse tangent of x which is equal to an angle whose tangent is equal to x.
tan α = x
..................getting the inverse tangent of both sides of the equation, we have:
tan^-1 (tan α ) = tan^-1 (x)
α = tan^-1 (x) 32.I cannot see what given on page 925.
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