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cos(π7)−cos(2π7)+cos(3π7)= ? \large \cos \left( \dfrac \pi7 \right) - \cos \left( \dfrac {2\pi}7 \right) + \cos \left( \dfrac {3\pi}7 \right) = \, ? cos(7π)−cos(72π)+cos(73π)=?
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