首先联立cosa-sina=3根号2/5,和cosa^2+sina^2=1.
再根据17π/12就是tana的值不会求，sina和cosa的值都求不出，怎么求tana？这个题目是不是有错啊？那个三角形算出来是负的喔。根号2/5，2/5是在根号里面的吗？还是只有2呢？根号里只有2，3倍根号2除以5联立cosa-sina=3根号2/5,和cosa^2+sina^2=1.设cosa=y，sina=x。即：y-x=(3根号2)/5, x^2+y^2=1化简得 2x^2+(6根号2)x/5-7/25=0由求根公式，且17π/12
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