若一个直角三角形三内角的正弦值成等比数列,则其中最小内角的正

若一个直角三角形三内角的正弦值成等比数列,则其中最小内角的正弦值为_________.

答案

 


解析:

设从小到大的三内角为,则成等比数列,

             得,而,即

             得,即

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