若π/4<α<3π/4,0<β<π/4,cos(π/4-α)=3/5,sin(3π/4+β)=5/13,则sin(α+β)=?这道题目我会做,但是算出来的答案就是跟标答不一样,所以要具体步骤和计算结果.
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![若π/4<α<3π/4,0<β<π/4,cos(π/4-α)=3/5,sin(3π/4+β)=5/13,则sin(α+β)=?这道题目我会做,但是算出来的答案就是跟标答不一样,所以要具体步骤和计算结果.](/uploads/image/z/5530146-42-6.jpg?t=%E8%8B%A5%CF%80%2F4%EF%BC%9C%CE%B1%EF%BC%9C3%CF%80%2F4%2C0%EF%BC%9C%CE%B2%EF%BC%9C%CF%80%2F4%2Ccos%28%CF%80%2F4-%CE%B1%29%3D3%2F5%2Csin%EF%BC%883%CF%80%2F4%2B%CE%B2%EF%BC%89%3D5%2F13%2C%E5%88%99sin%28%CE%B1%2B%CE%B2%29%3D%3F%E8%BF%99%E9%81%93%E9%A2%98%E7%9B%AE%E6%88%91%E4%BC%9A%E5%81%9A%2C%E4%BD%86%E6%98%AF%E7%AE%97%E5%87%BA%E6%9D%A5%E7%9A%84%E7%AD%94%E6%A1%88%E5%B0%B1%E6%98%AF%E8%B7%9F%E6%A0%87%E7%AD%94%E4%B8%8D%E4%B8%80%E6%A0%B7%2C%E6%89%80%E4%BB%A5%E8%A6%81%E5%85%B7%E4%BD%93%E6%AD%A5%E9%AA%A4%E5%92%8C%E8%AE%A1%E7%AE%97%E7%BB%93%E6%9E%9C.)
若π/4<α<3π/4,0<β<π/4,cos(π/4-α)=3/5,sin(3π/4+β)=5/13,则sin(α+β)=?这道题目我会做,但是算出来的答案就是跟标答不一样,所以要具体步骤和计算结果.
若π/4<α<3π/4,0<β<π/4,cos(π/4-α)=3/5,sin(3π/4+β)=5/13,则sin(α+β)=?
这道题目我会做,但是算出来的答案就是跟标答不一样,所以要具体步骤和计算结果.
若π/4<α<3π/4,0<β<π/4,cos(π/4-α)=3/5,sin(3π/4+β)=5/13,则sin(α+β)=?这道题目我会做,但是算出来的答案就是跟标答不一样,所以要具体步骤和计算结果.
∵π/4<α<3π/4
∴-π/2
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