13ãsin(3Ï/5)=sin(0.6Ï)
sin(4Ï/5)=sin(0.8Ï)
sin(9Ï/10)=sin(0.9Ï)
sinxå¨ãÏ/2ï¼Ïãåºé´å
为åå½æ°ï¼å
sin(3Ï/5)>sin(4Ï/5)>sin(9Ï/10)
14ãy=asinx+b
å½ a>0æ¶ï¼a+b=3ï¼-a+b=1ï¼è§£å¾ a=-1ï¼b=2ï¼å ab=-2
å½ a<0æ¶ï¼a+b=1ï¼-a+b=3ï¼è§£å¾ a=-1ï¼b=2ï¼å ab=-2
æ
ab=-2
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