Questions
If are the roots of the equation are the roots of the equation , then values of b are
detailed solution
Correct option is A
We have, cos2θ−sin2θ=cos2θ⇒ cos4θ−sin4θ=cos2θ⇒ (−2b)2−4b=(−4)2−4×2(since L.H.S. is difference of roots of first equation and R.H.S. is difference of roots of second equation)or 4b2−4b=16−8=8or 4b2−4b−8=0or b2−b−2=0or (b+1)(b−2)=0or b=2,−1Similar Questions
If has unequal real roots for all , then
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