设角α终边上一点P的坐标是 (cosπ/5,sinπ/5)则α=设角α终边上一点P的坐标是 (-cosπ/5,-sinπ/5)则α_数学解答

设角α终边上一点P的坐标是 (cosπ/5,sinπ/5)则α=
设角α终边上一点P的坐标是 (-cosπ/5,-sinπ/5)则α=
设角α终边上一点P的坐标是 (sinπ/5,-cosπ/5)则α=

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解答

设角α终边上一点P的坐标是 (cosπ/5,sinπ/5)则α=π/5