यदि alpha = (pi)/(7) हो, तो ((1)/(cos alpha) + (2 cos alpha)/(cos 2 alpha)) का मान ज्ञात कीजिए |
If p = cos 2alpha + i sin 2alpha , q = cos 2beta + i sin 2beta then the value of sqrt(p/q) - sqrt(q/p)=
( 2 , 1 , - 1 ) , $$ 综上所述,求得$$ \overrightarrow { a } = ( 2 . 1 . 1 ) $$或$$ \overrightarrow { a } = ( 2 , 1 , - 1 ) $$ 本题考查了求解向量,根据题意向量\overrightarrow{a}的两个方向余弦为cos\alpha =\frac{1}{3} ,cos\beta =\frac{2}{3},又...
\beta + \cos ^ { 2 } \gamma = 1 $$求证:对任意实数x,y,z有$$ \frac { 1 } { 2 } ( x ^ { 2 } + y ^ { 2 } + z ^ { 2 } ) $$$ \cot \beta \cot \gamma \cdot y z + \cot \gamma \cot \gamma \cot \alpha \cdot z x + \cot \alpha \cot \beta...
Hint: 1+tan2α1−tan2α=1+tan4πtan2αtan4π−tan2α=tan(4π−2α) Why is sinα−sinβ=2cos(2α+β)sin(2α−β)? https://www.quora.com/Why-is-sin-alpha-sin-beta-2-cos-left-frac-alph...
Step by step video, text & image solution for यदि cosalpha+2cosbeta+3cosgamma=0, sinalpha+2sinbeta+3singamma=0 और alpha+beta+gamma=pi है तब sin3alpha+8sin3beta+27sin3gamma= by Maths experts to help you in doubts & scoring excellent marks in Class 12 exams...
যদি alpha+gamma=2beta হয় তবে দেখাও যে,cotbeta=(sinalpha-singamma)/(cosgamma-cosalpha)
$$ \tan \alpha \tan \beta \tan \gamma = \frac { \sqrt { 1 - \cos ^ { 2 } \alpha } } { \cos \alpha } \cdot \frac { \sqrt { 1 - \cos ^ { 2 } \beta } } { \cos \beta } \\ \frac { \sqrt { 1 - \cos ^ { 2 } \gamma } } { \cos \gamma ...
【解析】 分析 由$$ \cos ^ { 2 } \alpha + \cos ^ { 2 } \beta + \cos ^ { 2 } \gamma - 1 $$,得到a、B、y的更直接,更明了的关系$$ \cos ^ { 2 } \alpha + \cos ^ { 2 } \beta = $$ $$ \sin ^ { 2 } y $$,这是平方关系,而要证明的式子的左边是乘积和...
Why is cosαsinβ=21[sin(α+β)−sin(α−β)]? https://www.quora.com/Why-is-cos-alpha-sin-beta-frac-1-2-sin-alpha+-beta-sin-alpha-beta To show why, our goal will be to manipulate the right side...