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- Question 3, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... )===== Find the exact value of $\cos 120^{\circ}$ by using $\cos \left(180^{\circ}-60^{\circ}\right)$ ... c)===== Find the exact value of $\cos 75^{\circ}$ by using $\cos \left(120^{\circ}-45^{\circ}\right)$.... sqrt{3}-1}{2\sqrt{2}}$ to find $\cos 105^{\circ}$ by using $\cos \left(180^{\circ}-75^{\circ}\right)$.
- Question 2, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... a)===== Find the exact value of $\cos 15^{\circ}$ by using $\cos \left(45^{\circ}-30^{\circ}\right)$. ... sqrt{3}+1}{2\sqrt{2}}$ to find $\cos 165^{\circ}$ by using $\cos \left(180^{\circ}-15^{\circ}\right)$.... sqrt{3}+1}{2\sqrt{2}}$ to find $\cos 345^{\circ}$ by using $\cos \left(360^{\circ}-15^{\circ}\right)$.
- Question 14, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... ===== Question 14===== A telephone pole is braced by two wires that are both fastened to the ground at... that the longer wire makes with the ground, then by Pythagoras theorem \begin{align*} & \overline{AD}
- Question 5 and 6, Review Exercise
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... \alpha \sin \theta\end{align*} Divided both sides by $\cos \alpha \cos \theta$ \begin{align*} & \frac{... alpha \sin \theta\end{align*} Dividing both sides by $\cos \alpha \cos \theta$ \begin{align*} & \frac
- Question 8(i, ii & iii) Exercise 8.2
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... {\theta}{2}}{2\cos^2 \frac{\theta}{2}}\quad \text(by \,using\, half\, angle\, identity)\\ &=\tan \frac
- Question 8(x, xi & xii) Exercise 8.2
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... ta}{2}}\\ &= \frac{1}{\frac{\sin \beta}{2}}\quad (by\, using\,half \, angle\, identity)\\ &=2 \csc \be
- Question 8(xvi, xvii & xviii) Exercise 8.2
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... {2}}{2-2 (1-2\sin^2 \frac{\beta}{2} )}\quad \text{by using half angle identity}\\ &= \dfrac{4\sin ^{
- Question 7, Review Exercise
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo... alpha \sin \theta\end{align*} Dividing both sides by $\cos \alpha \cos \theta$ \begin{align*} & \frac
- Question 1, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo
- Question 4, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo
- Question 5 and 6, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo
- Question 7, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo
- Question 8, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo
- Question 9, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo
- Question 10, Exercise 8.1
- el Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textboo