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∑r=1∞[12rtan(π/42r)] \large \sum_{r=1}^\infty \left[ \frac1{2^r} \tan\left( \frac{\pi /4}{2^r} \right) \right ] r=1∑∞[2r1tan(2rπ/4)]
If the series above equals to AπB+C A\pi^B + CAπB+C for integers A,BA,BA,B and CCC, find the value of A×B×CA\times B\times CA×B×C.
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