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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.
if 2(acosx-cos2x)=1 for x belongs to R then find all the possible
real values of a.
2acosx-2cos2x-1=02acosx-2(2cos2x-1)-1=04cos2x+2acosx+1=0for real roots D greater then equal to zero4a2-16>=0a2>=4so a greater then equal to 2 or less then equal to -2.Thanks & RegardsSunil RaikwaraskIITians Faculty
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