Question

if (1 + cos A) (1 - Cos A) =3/4, find the value of sec A.​

Answer 1

Answer:

Given (1+cosA)(1−cosA)=

4

3

⟹1−cos

2

A=

4

3

⟹cos

2

A=1−

4

3

⟹cos

2

A=

4

4−3

⟹cos

2

A=

4

1

⟹sec

2

A=4

⟹secA=±2

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