Скачать или смотреть 👉 HSC Class 12 Maths | Derivatives Ex 1.2 Q9 Full Solution | Lecture 12 | Easy Step by Step

📘 Welcome to Lecture 12 of our HSC Class 12 Maths Derivatives Series!
In this video, we will solve Exercise 1.2, Question 9 (Full Solution) from the Derivatives chapter.
Step-by-step explanation in a simple way so that every student can understand and score full marks in Board Exams.

✨ What you’ll learn in this lecture:
• Complete solution of Ex 1.2 Q9
• Easy tricks to solve derivatives
• Board exam-oriented explanation
0:00 – Intro & Derivatives Recap
0:42 – Question 9 Introduction (Ex 1.2 – HSC Board)
1:25 – Part (i) Solution (cos form simplification)
3:15 – Part (ii) Solution (sin form simplification)
5:05 – Part (iii) Using tan inverse identity
7:20 – Part (iv) & (v) Solutions step by step
10:30 – Parts (vi) to (ix): Using sin2θ, cos2θ substitutions
14:20 – Part (x) & (xi): Chain rule applications
16:45 – Part (xii): Final simplification and derivative
18:00 – Quick Recap + Key Exam Tip
18:45 – Next Lecture Preview (Q10)

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