Prove that \[ \cos x \cos \frac{x}{2}-\cos 3 x \cos \frac{9 x}{2}=\sin 4 x \sin \frac{7 x}{2} \]

Channel:
PW Solutions
Subscribers:
515,000
Published on ● Video Link: https://www.youtube.com/watch?v=v6VaP0cXOmg


Duration: 6:24
3 views
0

Prove that
\[
\cos x \cos \frac{x}{2}-\cos 3 x \cos \frac{9 x}{2}=\sin 4 x \sin \frac{7 x}{2}
\]
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2022-10-26Who had organised the Dalits into the 'Depressed Classes Association' in 1930? Describe his achie...
2022-10-26How did plantation workers in Assam had their own understanding of Mahatma Gandhi and the notion ...
2022-10-26"Nationalism spreads when people begin to believe that they are all part of the same nation". Jus...
2022-10-26"Dalit participationas limited in the Civil Disobedience Movement". Examine the statement.
2022-10-26Prove that: \[ \sin \left(\frac{\pi}{4}+x\right) \sin \left(\frac{\pi}{4}-x\right)=\frac{1}{2} \...
2022-10-26Explain the role of women in the Civil Disobedience Movement. Or When did the women of India see ...
2022-10-26The Civil Disobedience Movement was different from the Non-Cooperation Movement.' Support the sta...
2022-10-26Prove that: \[ \sin 10^{\circ} \sin 50^{\circ} \sin 70^{\circ}=\frac{1}{8} \]
2022-10-26Prove that \( \cos 3 x+\cos 5 x+\cos 7 x+\cos 15 x=4 \cos 4 x \cos 5 x \cos 6 x \)
2022-10-26How did the 'Non-Cooperation Movement' spread in cities across the country? Explain its effects o...
2022-10-26Prove that \[ \cos x \cos \frac{x}{2}-\cos 3 x \cos \frac{9 x}{2}=\sin 4 x \sin \frac{7 x}{2} \]
2022-10-26How did the Civil Disobedience Movement came into force in various parts of the country? Explain ...
2022-10-26Who launched the Khilafat Movement? Why was the movement launched? or What were the circumstances...
2022-10-26Prove that: \( \cos 20^{\circ}+\cos 100^{\circ}+\cos 140^{\circ}=0 \)
2022-10-26Prove that: \[ \cos 5^{\circ}-\sin 25^{\circ}=\sin 35^{\circ} \]
2022-10-26Prove that: \[ \sec \left(\frac{\pi}{4}+x\right) \sec \left(\frac{\pi}{4}-x\right)=2 \sec 2 x \]
2022-10-26Prove that: \[ \cos 52^{\circ}+\cos 68^{\circ}+\cos 172^{\circ}=0 \]
2022-10-26Prove that: \[ \cos 7 x+\cos 5 x+\cos 3 x+\cos x=4 \cos x \cos 2 x \cos 4 x \]
2022-10-26Prove that: \[ \frac{\sin x-\sin y}{\cos x+\cos y}=\tan \frac{x-y}{2} \text {. } \]
2022-10-26Explain four points about Gandhiji's Satyagraha. or Gandhiji's idea of Satyagraha emphasised the ...
2022-10-26Prove that : \[ \sin \left(\frac{5 \pi}{6}+x\right)+\sin \left(\frac{5 \pi}{6}-x\right)=\cos x \]


Tags:
pw