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最佳答案:好像没有北向南θ度这种说法,“between North and the direction in which he rows”我理解是他划船的角度是从北向B点
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最佳答案:1.2sin^2(x-π/12) = 1 - cos[2·(x-π/12)] = 1 - cos(2x-π/6) ,∴f(x) = 2·{(√3/2)sin(2