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Grade: 

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

Answers : (1)

Sunil Raikwar
askIITians Faculty
45 Points 
							2acosx-2cos2x-1=0
2acosx-2(2cos2x-1)-1=0
4cos2x+2acosx+1=0
for real roots D greater then equal to zero
4a2-16>=0
a2>=4
so a greater then equal to 2 or less then equal to -2.

Thanks & Regards
Sunil Raikwar
askIITians Faculty
6 years ago
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