已知角a 终边上一点P(-4,3),求[cos(π/2+a)sin(-π-a)] / cos(11π/2-a)sin(9π/2+a)的值为什么我算出来的是 -3/4 而答案是-4/3
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![已知角a 终边上一点P(-4,3),求[cos(π/2+a)sin(-π-a)] / cos(11π/2-a)sin(9π/2+a)的值为什么我算出来的是 -3/4 而答案是-4/3](/uploads/image/z/5410455-15-5.jpg?t=%E5%B7%B2%E7%9F%A5%E8%A7%92a+%E7%BB%88%E8%BE%B9%E4%B8%8A%E4%B8%80%E7%82%B9P%EF%BC%88-4%2C3%EF%BC%89%2C%E6%B1%82%5Bcos%EF%BC%88%CF%80%2F2%2Ba%EF%BC%89sin%EF%BC%88-%CF%80-a%EF%BC%89%5D+%EF%BC%8F+cos%EF%BC%8811%CF%80%2F2-a%EF%BC%89sin%EF%BC%889%CF%80%2F2%2Ba%EF%BC%89%E7%9A%84%E5%80%BC%E4%B8%BA%E4%BB%80%E4%B9%88%E6%88%91%E7%AE%97%E5%87%BA%E6%9D%A5%E7%9A%84%E6%98%AF+-3%2F4+%E8%80%8C%E7%AD%94%E6%A1%88%E6%98%AF-4%2F3)
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