Question

If ( 1 + Cos A)( 1 - Cos A) = 3\4, then find the value of Sec A.

Answer 1

Answer:

(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 = 2Step-by-step explanation: