If the line segment joining the points \( P\left(x_{1}, y_{1}\right) \) and \( Q\left(x_{2}, y_{...

Channel:
PW Solutions
Subscribers:
510,000
Published on ● Video Link: https://www.youtube.com/watch?v=3l4UDctHaeM


Duration: 1:20
4 views
0

If the line segment joining the points \( P\left(x_{1}, y_{1}\right) \) and \( Q\left(x_{2}, y_{2}\right) \) subtends an angle \( \alpha \) at the origin \( O \), prove that: \( O P \cdot O Q \cos \alpha=x_{1} x_{2}+y_{1} y_{2} \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2022-11-17Show that the slope of the velocity-time graph represents the acceleration.
2022-11-17Convert \( \frac{1+3 i}{1-2 i} \) into the polar form
2022-11-17Dermatologists often remove small precancerous skin lesions by freezing them quickly with liquid...
2022-11-17If \( 1+\cos 2 x+\cos 4 x+\cos 6 x=k \cos x \cos 2 x \cos 3 x \), then \( k= \)
2022-11-17दो ट्रांसजीनी पदपों तथा दो ट्रांसजीनी जन्तुओं के नाम लिखिए।
2022-11-17निम्न में से कौन सजीव व निर्जीव दोनों के लक्षण प्रदर्शित करता है- (A) जीवाणु (B) डायटम्स (C) विष...
2022-11-17Assertion (A): Caryopsis fruits differ from typical achenes with respect to the fusion of perica...
2022-11-17A point \( \mathrm{P} \) moves in counter-clockwise direction on a circular path as shown in the...
2022-11-17\( \mathrm{NaCl} \) is a paramagnetic substance.
2022-11-17ऑक्सीजन की अनुपर्पिति में होने वाले श्वसन का नाम बताइए।
2022-11-17If the line segment joining the points \( P\left(x_{1}, y_{1}\right) \) and \( Q\left(x_{2}, y_{...
2022-11-17निम्नलिखित पदों (शब्दों) का वर्णन करो क्रॉस ऐल्डोल संघनन
2022-11-17B.C.G. शब्द का विस्तार कीजिए।
2022-11-17\( \frac{2 x}{\left(x^{2}+1\right)\left(x^{2}+3\right)} \)
2022-11-17A string of length \( L \) is stretched along \( x \)-axis is rigidly clamped as it ends, it und...
2022-11-17Assertion (A): The value of van der Waals' constant ' \( a \) ' is larger for \( \mathrm{NH}_{3}...
2022-11-17Two sinusoidal waves with identical wavelengths and amplitudes travel in opposite directions alo...
2022-11-17जब ऐसीटैमाइड को ब्रोमीन और कॉस्टिक सोडा \( (\mathrm{NaOH}) \) के साथ गर्म किया जाता है तो प्राप्...
2022-11-17समान्तर श्रेढ़ी का व्यापक रूप लिखिए।
2022-11-17Which of the following is logically equivalent to \( p \wedge q \) ? (A) \( p \rightarrow \sim q...
2022-11-17State the arrangement of different genes that in bacteria is referred to as 'operon'.