Question

2
I + COS
. 으
CosecA-1 Cot)
L-cos
$1 + cosa \1 - cosa = ( cosec + cot)2$
​

Answer 1

Answer:

=

(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

Answer 2

Answer:

this is your answer hope it helps