Find the magnitude of angle A, if :
2 cos^2 A - 3 cos A + 1 = 0
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Answered by
1
Step-by-step explanation:
Convert it into a quadratic equation and solve it. Hope it helps.
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Answered by
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A =60° and A=0° ( answer )
Step-by-step explanation:
2cos 2A -cos A -2cosA +1=0
cosA (2cosA -1)-(2cos A-1)=0
(2cosA-1)(cosA -1)=0
2 cosA-1=0 and cos A -1=0
cos A =1/2 and cos A=1
A=60° and A=0°
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