Question

Chapter- 8. Introduction to trigonometry. Ex 8.1. How to solve this question ??

Answer 1

I am considering theta=x
A.(1+sinx)(1-sinx)/(1+cosx)(1-cosx)
(1-sin^2x)/(1-cos^2x)
Cos^2x/sin^2x=cot^2x=(cotx)^2=49/64
B.cot^2x=(cotx)^2=49/64