Mathematics

Mathematics

Problem

∑r=1∞tan⁡−1(2(r+2)2)\sum_{r=1}^{\infty} \tan^{-1}\left(\frac{2}{(r+2)^2}\right) is a. π−(tan⁡−12+tan⁡−13)\pi - (\tan^{-1} 2 + \tan^{-1} 3) b. π4\frac{\pi}{4} c. 7π4\frac{7\pi}{4} d. π+(tan⁡−12+tan⁡−13)\pi + (\tan^{-1} 2 + \tan^{-1} 3)

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