Question
यदि $A = \left[ {\begin{array}{*{20}{c}}1&{\tan \theta /2}\\{ - \tan \theta /2}&1\end{array}} \right]$ और $AB = I$, तो $B = $
$ \Rightarrow$ $B = I{A^{ - 1}}$$\frac{{\left[ {\begin{array}{*{20}{c}}1&0\\0&1\end{array}} \right]\,\,\left[ {\begin{array}{*{20}{c}}1&{ - \tan \frac{\theta }{2}}\\{\tan \frac{\theta }{2}}&1\end{array}} \right]}}{{{{\sec }^2}\frac{\theta }{2}}}$= ${\cos ^2}\frac{\theta }{2}\,.\,{A^T}$.
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