sin(2a+b)/sina - 2cos(a+b)
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sin(2a+b)/sina - 2cos(a+b)
sin(2a+b)/sina - 2cos(a+b)
sin(2a+b)/sina - 2cos(a+b)
sin(2a+b)/sina - 2cos(a+b)
=[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