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- Question 6 Exercise 8.2
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder... \sin\theta \cos\theta = \frac{1}{2}\sin 2\theta$$ Put $\theta = 15^{\circ}$ \begin{align*} \sin 15^{\c... $$\cos^2\theta -\sin^2\theta= \cos 2\theta = $$ Put $\theta = 15^{\circ}$ \begin{align*} \cos^2 15^\... pha.$$ That is $$1-2\sin^2 \alpha=\cos 2\alpha.$$ Put $\alpha= \dfrac{\pi}{8}$, we have \begin{align*}
- Question 2, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder... $$\cos A=\sin \left(90^{\circ}-A\right) ... (1)$$ Put $A=15^\circ$, we get \begin{align*} & \sin \lef... \dfrac{\sqrt{3}+1}{2\sqrt{2}}}. \end{align*} Now put $A=75^\circ$ in (1) \begin{align*} \cos 75^\cir
- Question 1, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 3, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 4, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 5 and 6, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 7, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 8, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 9, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 10, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 11, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 12, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 13, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 14, Exercise 8.1
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder
- Question 1, 2 and 3 Exercise 8.2
- nit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Feder