Question

I-COSA
I+COSA
cosec- cat​

Answer 1

Answer:

Answer

1−cosA

1+cosA

=

(1−cosA)(1+cosA)

(1+cosA)

2

=

sin

2

A

(1+cosA)

2

=

(cosecA+cotA)

2

=∣cosecA+cotA∣

=cosecA+cotA (as given)

let cosecA + cotA = x

so we get |x| = x

this is possible only when x ⩾ 0

so cosecA + cotA ⩾ 0

this means that sinA > 0

this is possible only in first and second quadrants