Questions 10 and 11 from Ex 13.2 of Limits and Derivatives (Chapter 13) NCERT 11th/1st PUC Text Book. Solution explained in Kannada by Anand Kelsa. 00:00 Introduction 00:48 Q10: Derivative of cos(𝑥) from first principles 06:05 Q11(i): Derivative of sin(𝑥)cos(𝑥) 07:50 Q11(ii): Derivative of sec(𝑥) 10:06 Q11(iii): Derivative of 5sec(𝑥) + 4cos(𝑥) 12:09 Q11(iv): Derivative of cosec(𝑥) 14:06 Q11(v): Derivative of 3cot(𝑥) + 5cosec(𝑥) 15:44 Q11(vi): Derivative of 5sin(𝑥) − 6cos(𝑥) + 7 17:05 Q11(vii): Derivative of 2tan(𝑥) - 7sec(𝑥)