trigonometry

Related Questions

• $\sin \left( \frac{\pi }{10} \right)\sin \left( \frac{3\pi }{10} \right)=$

  ---

• If $\frac{\cos A}{\sin B\sin C}+\frac{\cos B}{\sin C\sin A}+\frac{\cos C}{\sin A\sin B}=$then $32\sin \left( \frac{A}{2} \right)\sin \left( \frac{5A}{2} \right)=$

  ---

• $\cos A+\cos (240{}^\circ +A)+\cos (240{}^\circ -A)=$

  ---

• If $\frac{\tan 3\theta -1}{\tan 3\theta +1}=\sqrt{3}$, then the general value of $\theta $is

  ---

• If $\cos \theta =\frac{1}{2}\left( x+\frac{1}{x} \right)$, then $\frac{1}{2}\left( {{x}^{2}}+\frac{1}{{{x}^{2}}} \right)=$

  ---