Question

1+cos a * 1-cos a = 3/4 find sec a

Answer 1

Step-by-step explanation:

given

1+cos a *1-cos a=3/4

1-cos²a=3/4

sin²a=3/4

sin a=√3/4

sin a=√3/2

by pathogorus theorem

h²=p²+b²

2²=√3²+b²

4=3+b²

b²=4-3

b²=1

b=√1=1

hence :-

the value of sec a=h/p=2/1=2

Answer 2

Answer:

Step-by-step explanation:

1 - cos^2 a = 3/4

1 - 3/4 = cos^2a

4-3/4

1/4 = cos^2a

square root on both the sides

1/2 = cos a

sec a = 2