Prove (sin2A-sinA)(1+2cosA)=sin3A i used the identity sinA-sinB=2cos(A+B)/2*sin(A-B)/2, but then i got stuck. Thanks
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Hello, arze! This requires Olympic-level gymnastics . . . Prove: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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