Choose the correct option(s):.... VIDEO
Choose the correct option(s):
(1) The value of \( \cos \frac{2 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{6 \pi}{7} \) is \( \left(-\frac{1}{8}\right) \)
(2) The value of \( \cos \frac{2 \pi}{7}+\cos \frac{4 \pi}{7}+\cos \frac{6 \pi}{7} \) is \( \left(-\frac{1}{2}\right) \)
(3) The value of \( \cos \frac{2 \pi}{7} \cos \frac{4 \pi}{7} \cos \frac{6 \pi}{7} \) is \( \left(\frac{1}{8}\right) \)
(4) The value of \( \cos \frac{2 \pi}{7} \cos \frac{4 \pi}{7} \cos \frac{6 \pi}{7} \) is \( \left(\frac{1}{2}\right) \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live
Other Videos By PW Solutions 2024-01-23 The number of solutions of the equation \( \sin 2 x-2 \cos \)
\( x+4 \sin x=4 \) in the interval.... 2024-01-23 Which of the following are the solutions of equation
\( 2 \sin 11 x+\cos 3 x+\sqrt{3} \sin 3 x=0.... 2024-01-23 If \( |\operatorname{cosec} x|=\frac{5 \pi}{4}-\left|\frac{x}{2}\right|, \forall x \in(-2 \pi, 2.... 2024-01-23 Consider the equation \( 2^{\sin x}+2^{\cos x}=2^{1-\frac{1}{\sqrt{2}}} \).
The number of soluti.... 2024-01-23 If \( 3^{\left(\frac{1}{2}+\log _{3}(\cos x+\sin x)\right)}-2^{\log _{2}(\cos x-\sin x)}=\sqrt{2.... 2024-01-23 If \( 6|\sin x|=x \) when \( x \in[0,2 \pi] \), then number of solutions
is.... 2024-01-23 The number of distinct real roots of the equation
\( \sin (\pi x)=x^{2}-x+\frac{5}{4} \) is.... 2024-01-23 Match the items of column I with those of column II.
\begin{tabular}{|l|l|l|l|}
\hline \multicol.... 2024-01-23 Which of the following statements is correct about the
solution set of the system of equations \.... 2024-01-23 If the equation \( x^{2}+12+3 \sin (a+b x)+6 x=0 \) has at least one real solution where \( a, b.... 2024-01-23 Choose the correct option(s):.... 2024-01-23 The number of solutions of the equation
\( \sin \frac{5 x}{2}-\sin \frac{x}{2}=2, x \in[0,2 \pi].... 2024-01-23 Let \( x+\sin y=2009 \) and \( x+2009 \cos y=2008 \), where
\( y \in\left[0, \frac{\pi}{2}\right.... 2024-01-23 Match the items of column-I with of column-II.
\begin{tabular}{|c|c|c|c|}
\hline \multicolumn{2}.... 2024-01-23 If \( a^{2}-2 a \cos x+1=674 \) and \( \tan \left(\frac{x}{2}\right)=7 \), then the
integral val.... 2024-01-23 If the expression, \( 2 \cos 10^{\circ}+\sin 100^{\circ}+\sin 1000^{\circ}+ \)
\( \sin 10000^{\c.... 2024-01-23 Match the items of column I with those of column II
\begin{tabular}{|l|l|l|l|}
\hline \multicolu.... 2024-01-23 If \( m \) and \( n \) are positive integers satisfying
\( 1+\cos 2 \theta+\cos 4 \theta+\cos 6 .... 2024-01-23 If \( \sqrt{4+\sqrt{8-\sqrt{32+\sqrt{768}}}}=a \sqrt{2} \cos \left(\frac{11 \pi}{b}\right) \), w.... 2024-01-23 Match the items of column I with those of column II.
\begin{tabular}{|c|c|c|c|}
\hline \multicol.... 2024-01-23 Sometimes we use trigonometric identities to find the roots of an equation. For example, if \( \....