if (1+cosA) (1-cosA)=3/4 find sec a

(1+cosA)(1-cosA) =3/4
​or, 1² - cos^​2A=3/4
or, sin²A=3/4
or, sinA=root(3/4)
or, sinA={root(3)}/2
or, sinA=sin 60
or,A=60
now, as per sum,
sec A
or, sec 60
or, sec 60=2