Question

Look at the picture

Answer 1

Step-by-step explanation:

sinA/ 1+cos A= 1-cos A/ sinA

divide ko simply multiply mei le jao

sin^2A= (1+cosA)(1-cosA)

using Identity (a+b)(a-b) = a^2-b^2

sin^2A= 1-cos^2A

sin^2A+ cos^2A = 1

this is also an identity