Class 10 Maths | Trigonometry Ex 8.1 Q7 | If cot θ = 7/8 | NCERT Solution

In this video, we solve NCERT Class 10 Mathematics – Chapter 8: Introduction to Trigonometry, Exercise 8.1, Question 7 step by step. 📌 Question: If cot θ = 7/8, evaluate: (i) (1 + \sin θ)(1 - \sin θ) \,/\, (1 + \cos θ)(1 - \cos θ) (ii) \cot^2 θ 🔍 Concepts used (NCERT method): • Standard trigonometric identities • Conversion of expressions using identities • Relation between sin, cos, tan, cot • Simplification using 1 − sin²θ = cos²θ and 1 − cos²θ = sin²θ 🧠 Logical exam intuition: NCERT designs this question to test whether students can identify identities inside complex expressions and simplify them logically instead of memorising formulas. This exact approach helps you score full marks in board exams. 📘 Best for: ✔ CBSE & State Board students ✔ Board exam identity-based questions ✔ Strengthening trigonometry fundamentals 👍 Like the video if it helps 🔔 Subscribe for complete Exercise 8.1 solutions 💬 Comment your doubts below