Question

Find the value of (1 + cosA)(1 - cosA) cosec2A​

Answer 1

Answer:

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