11th Class
Mathematics
Sample Paper
Maths Olympiad Model Test Paper-10
question_answer
If e is the eccentricity of the hyperbola \[\frac{{{x}^{2}}}{{{a}^{2}}}-\frac{{{y}^{2}}}{{{b}^{2}}}=1\] and \[\theta \] is the angle between the asymptotes, then \[\cos \left( \frac{\theta }{2} \right)\] is equal to______.