Question

costheta- sintheta+1/costheta+sintheta-1

Answer 1

Step-by-step explanation:

first divide the numerator and denominator by SIN A

In 4th line

(cosec^2 A - cot^2 A) = (cosecA+cotA)(cosecA-cotA)

by using identity a^2 – b^2 = (a + b)(a – b)