Find the magnitude of angle A, if 2cos2 A – 3cosA + 1 = 0.
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Step-by-step explanation:
2cos
2
A−3cosA+1=0
2cos
2
A−cosA−2cosA+1=0
cosA(2cosA−1)−(2cosA−1)=0
(2cosA−1)(cosA−1)=0
(2cosA−1)=0;(cosA−1)=0
cosA=
2
1
;cosA=1
A=60
o
;A=0
o
hope this helps
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