In a \( \triangle A B C \), prove that
Chap 01 Trigonometric Functions and Identities
\[
\sum_{r... VIDEO
In a \( \triangle A B C \), prove that
Chap 01 Trigonometric Functions and Identities
\[
\sum_{r=0}^{n}{ }^{n} C_{r} a^{r} b^{n-r} \cos (r B-(n-r) A)=c^{n} .
\]
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live
Other Videos By PW Solutions 2022-11-16 If the complex numbers \( z_{1}=a+i, z_{2}=1+i b, z_{3}=0 \) form the vertices of equilateral tr... 2022-11-16 Find the quality factor of the oscillator whose displacement amplitude decreases \( \eta=2.0 \) ... 2022-11-16 The occurs in layers below the epidermis in dicotyledonous plants.
(A) parenchyma
(B) sclerenchy... 2022-11-16 sum of the coefficients of the first, second and third terms in the expansion of \( \left(x^{2}+... 2022-11-16 Which of the following halides is most acidic?
(A) \( \mathrm{PCl}_{3} \)
(B) \( \mathrm{CCl}_{4... 2022-11-16 The area enclosed by the curve \( [x+3 y]=[x-2] \) where \( x \in[3,4) \) is :
(where [.] denote... 2022-11-16 The scientist who gave the name 'Porifera' to the sponges was Robert E Grant. 2022-11-16 निम्नलिखित के मुख्य मान ज्ञात कीजिए : \[ \cot ^{-1}(1) . \] 2022-11-16 विस्तृत उत्तरीय प्रकार के प्रश्न Long Answer Type Questions
उपयुक्त उदाहरणों की सहायता से स्पष्ट... 2022-11-16 How many sets of 2 and 3 (different) numbers can be formed by using numbers between 0 and 180 (b... 2022-11-16 In a \( \triangle A B C \), prove that
Chap 01 Trigonometric Functions and Identities
\[
\sum_{r... 2022-11-16 Assertion (A): All reptiles have three-chambered heart.
Reason (R): Reptilian heart is more adva... 2022-11-16 Separate the intervals of monotonicity for the functions: \[ f(x)=\sin x+\cos x, x \in(0,2 \pi) \] 2022-11-16 \( \mathrm{O}_{2} \mathrm{~N}-\mathrm{C}_{6} \mathrm{H}_{4}-\mathrm{OCH}_{3}(p) \) 2022-11-16 The energy of electron in first excited state of \( \mathrm{H} \)-atom is \( -3.4 \mathrm{eV} \)... 2022-11-16 Each planet revolves around the sun in an elliptical orbit with the sun situated at centre of th... 2022-11-16 अनन्त तनुता पर \( \mathrm{NaOH}, \mathrm{NaCl} \) तथा \( \mathrm{BaCl}_{2} \) की मोलर चालकताएँ क... 2022-11-16 A radioactive nucleus can decay by two different processes. The half-life for the first process ... 2022-11-16 cand dareroots of the equation \( (x-a)(x-b)-k=0 \), then \( a, b \) are roots of the equation
(... 2022-11-16 The number of roots of the equation \( \sin ^{-1} x-\frac{1}{\sin ^{-1} x}=\cos ^{-1} x-\frac{1}... 2022-11-16 संकटग्रस्त जातियों से आप क्या समझते है? किन्ही दो भारतीय स्तनधारी संकटग्रस्त प्राणियों के नाम बत...