2sin^2 A + cos A -2 =0; 0
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2 (1-Cos^2 A) + Cos A -2 =0
2 - 2Cos^2 A + Cos A -2 = 0
Cos A - 2 Cos^2 A =0
Cos A(1-2Cos A) =0
Cos A = 0 or 1-2Cos A =0
Cos A = Cos 90 (or) Cos A =(1/2)
A =90 or Cos A = Cos 60
A = 90 or A =60
2 - 2Cos^2 A + Cos A -2 = 0
Cos A - 2 Cos^2 A =0
Cos A(1-2Cos A) =0
Cos A = 0 or 1-2Cos A =0
Cos A = Cos 90 (or) Cos A =(1/2)
A =90 or Cos A = Cos 60
A = 90 or A =60
themayank05:
thanx bro
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