A(x)=cos3x+1/2sin2x-2cos^3x+2cosx 1- calcul A(-pi/6) et a(pi/4)
2-démontrez que cos3x=(1-4sin^2x)cosx
et a(x)=(-2sin^2x+SINX+1)cosx
svp
2-démontrez que cos3x=(1-4sin^2x)cosx
et a(x)=(-2sin^2x+SINX+1)cosx
svp
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