If and then is equal to a b + c d ^ -1 (3) where are in their lowest form

MATHEMATICS · Subjective · CBSE · Mathematics · Inverse Trigonometric Functions · Inverse Trigonometric Functions

Problem

If A=11cot⁡−1(11)+12cot⁡−1(12)+13cot⁡−1(13)A = \frac{1}{1} \cot^{-1}\left(\frac{1}{1}\right) + \frac{1}{2} \cot^{-1}\left(\frac{1}{2}\right) + \frac{1}{3} \cot^{-1}\left(\frac{1}{3}\right) and B=1cot⁡−1(1)+2cot⁡−1(2)+3cot⁡−1(3)B = 1 \cot^{-1}(1) + 2 \cot^{-1}(2) + 3 \cot^{-1}(3) then ∣B−A∣|B - A| is equal to aπb+cdcot⁡−1(3)\frac{a\pi}{b} + \frac{c}{d} \cot^{-1}(3) where a,b,c,d∈Na, b, c, d \in \mathbb{N} are in their lowest form, find (b−a−c−d)(b - a - c - d)

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