If (1+cos a ) (1-cos a)=3/4 find the value of sec a
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(1+ cos A)(1- cos A)=3/4
1^2-cos^2 A=3/4
1-cos^2 A=3/4
sin^2 A=3/4
sin A= root3/2
but sin 60=root3/2
so
A=60
sec 60 = 2
so sec 60 = 2
1^2-cos^2 A=3/4
1-cos^2 A=3/4
sin^2 A=3/4
sin A= root3/2
but sin 60=root3/2
so
A=60
sec 60 = 2
so sec 60 = 2
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