trigonometry

Related Questions

• If $\theta $ lies in the second quadrant, then the value of $\sqrt{\left( \frac{1-\sin \theta }{1+\sin \theta } \right)}+\sqrt{\left( \frac{1+\sin \theta }{1-\sin \theta } \right)}$

  ---

• In triangle $ABC,$ $\frac{1+\cos (A-B)\cos C}{1+\cos (A-C)\cos B}=$

  ---

• If $\sqrt{x}+\frac{1}{\sqrt{x}}=2\cos \theta ,$then ${{x}^{6}}+{{x}^{-6}}=$

  ---

• Given that $\pi <\alpha <\frac{3\pi }{2},$ then the expression $\sqrt{(4{{\sin }^{4}}\alpha +{{\sin }^{2}}2\alpha )}+4{{\cos }^{2}}\left( \frac{\pi }{4}-\frac{\alpha }{2} \right)$ is equal to

  ---

• If $A+B+C={{180}^{o}},$ then $\frac{\sin 2A+\sin 2B+\sin 2C}{\cos A+\cos B+\cos C-1}=$

  ---