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If A=pi/5, then find the value of sum(r=...

If `A=pi/5,` then find the value of `sum_(r=1)^8tan(r A)tan((r+1)A)dot`

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To solve the problem, we need to compute the value of the summation: \[ \sum_{r=1}^{8} \tan(rA) \tan((r+1)A) \] where \( A = \frac{\pi}{5} \). ...
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