Thread: Math help
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Old 12-15-2009   #6
J()e
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0.5*sin2x=-cosx
0.5*2*sinx*cosx=-cosx
sinx*cosx+cosx=0
cosx(sinx+1)=0
cosx=0 and sinx+1=0
x=pi/2+kpi and x =3pi/2+2kpi

I think mazbouta
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