化简 (21 21:8:15)sin(2a+b)/sina-2cos(a+b)
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化简 (21 21:8:15)sin(2a+b)/sina-2cos(a+b)
化简 (21 21:8:15)
sin(2a+b)/sina-2cos(a+b)
化简 (21 21:8:15)sin(2a+b)/sina-2cos(a+b)
sin(2a+b)/sina-2cos(a+b)
=[sin(2a+b)-2cos(a+b)sina]/sina
=[sina*cos(a+b)+sin(a+b)*cosa-2cos(a+b)sina]/sina
=[sin(a+b)*cosa-cos(a+b)sina]/sina
=sin(a+b-a)/sina
=sinb/sina
化简 (21 21:8:15)sin(2a+b)/sina-2cos(a+b)
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