if 2(acosx-cos2x)=1 for x belongs to R then find all the possible

real values of a.

Question

if 2(acosx-cos2x)=1 for x belongs to R then find all the possible real values of a.

Sunil Raikwar · Answer

2acosx-2cos2x-1=0 2acosx-2(2cos 2 x-1)-1=0 4cos 2 x+2acosx+1=0 for real roots D greater then equal to zero 4a 2 -16>=0 a 2 >=4 so a greater then equal to 2 or less then equal to -2. Thanks & Regards Sunil Raikwar askIITians Faculty

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if 2(acosx-cos2x)=1 for x belongs to R then find all the possible real values of a.

if 2(acosx-cos2x)=1 for x belongs to R then find all the possible

real values of a.

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