This is an important question taken from the Book
Book- ML Aggarwal
Chapter- Trigonometric Identities
We have to prove that equality holds true.
(i) cosec4 θ – cosec2 θ = cot4 θ + cot2 θ
(ii) 2 sec2 θ – sec4 θ– 2 cosec2 θ + cosec4 θ = cot4 θ – tan4 θ.
Class 10, chapter 18, trigonometric identities, ICSE board, ML aggarwal, question 20