sin7π/3 cos(—π/6)+sin(—π/6) cos7π/3

长川19772022-10-04 11:39:541条回答

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kaloo 共回答了18个问题 | 采纳率94.4%
sin7π/3 cos(—π/6)+sin(—π/6) cos7π/3 =sin[7π/3+(-π/6)] =sin(13π/6) =sin(2π+π/6) =sinπ/6 =1/2
1年前

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