Question

9. Prove that :
Undeeroot 1 + cos A
/1 - cos A
ſcosec A + cot A) if 0<A<π
(- cosec A - cot A) if π<A<2π​

Answer 1

Answer:

after rationalize we get

1+cos A/sinA and we can write it as

(cosecA+cotA) an we know in first quadrant value of all trigonometry ratio is possitive

Answer 2

Answer:

cosecA+cotA, hence proved