Question

cosA/1- tanA + sin A / 1-cotA = sin A + cos A

Answer 1

Hope u understood the step
To take - common from denominator

Answer 2

cosA/1-sinA/cosA+sinA/1-cosA/sinA
cos^2A/cosA-sinA+sin^2A/sinA-cosA
cos^2A-sin^2A/cosA-sinA
(cosA-sinA)(cosA+sinA)/(cosA-sinA)
cosA+sinA