If (1 + cos A) (1 – cos A) =3/4, find the value of sec A.
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Answer:
2
Step-by-step explanation:
(1-cosA)(1+cosA)= 3/4
1-cos^2A= 3/4
sin^2A= 3/4
sinA= √3/2
sinA=sin60°
A=60°
secA=sec60°= 2
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