If \( \cot \alpha \cot \beta=2 \), show that \( \frac{\cos (\alpha+...

Channel:
PW Solutions
Subscribers:
449,000
Published on ● Video Link: https://www.youtube.com/watch?v=7s0X_BRqRHw


Duration: 3:45
97 views
0

If \( \cot \alpha \cot \beta=2 \), show that \( \frac{\cos (\alpha+\beta)}{\cos (\alpha-\beta)}=\frac{1}{3} \).
W
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2023-02-14If \( \sin \alpha=\frac{15}{17} \) and \( \cos \beta=\frac{12}{13} ...
2023-02-14If \( \sin \alpha=\frac{15}{17} \) and \( \cos \beta=\frac{12}{13} ...
2023-02-14Find \( a \) and \( b \) such that \( a \leq 3 \cos \theta+5 \sin \...
2023-02-14Prove that : \[ \cos ^{2}\left(\frac{\pi}{8}+\frac{x}{2}\right)-\si...
2023-02-14If \( \cos A=\frac{5}{13} \), and \( \sin B=\frac{4}{5} \), find \(...
2023-02-14The lower end of a capillary tube is at a depth of \( 12 \mathrm{~cm} \) and water rises \( 3 \m...
2023-02-14Prove that : \[ \cos \theta-\sin \theta=\sqrt{2} \cos \left(\theta+...
2023-02-14Prove that: (ii) \( 2 \tan 70^{\circ}=\tan 80^{\circ}-\tan 10^{\cir...
2023-02-14Water rises to a height \( h \) in a capillary tube of cross-sectional area \( A \). The height ...
2023-02-14Prove that: (i) \( \tan 50^{\circ}=\tan 40^{\circ}+2 \tan 10^{\circ...
2023-02-14If \( \cot \alpha \cot \beta=2 \), show that \( \frac{\cos (\alpha+...
2023-02-14Prove that: \[ \frac{\cos 13^{\circ}+\sin 13^{\circ}}{\cos 13^{\cir...
2023-02-14Prove that : \[ \tan 69^{\circ}+\tan 66^{\circ}+1=\tan 69^{\circ} \...
2023-02-14A soap film of surface tension \( 3 \times 10^{-2} \) formed in a rectangular frame can support ...
2023-02-14The volume of oxygen liberated at STP from \( 15 \mathrm{~mL} \) of 20 volume \( \mathrm{H}_{2} ...
2023-02-14If \( \cos (\alpha-\beta)+\cos (\beta-\gamma)+\cos (\gamma-\alpha)=...
2023-02-14If \( \theta-\phi=\frac{\pi}{4} \), prove that : \[ (1+\tan \theta)...
2023-02-14The surface energy of a liquid drop is \( E \). It is sprayed into 1000 equal droplets. Then its...
2023-02-14Prove that : \[ \frac{\sin (B-C)}{\cos B \cos C}+\frac{\sin (C-A)}{...
2023-02-14If \( \theta-\phi=\frac{\pi}{4} \), prove that : \[ (1+\tan \theta)...
2023-02-14If \( \theta+\phi=45^{\circ} \), prove that \( (\cot \theta-1)(\cot...


Tags:
pw