trigonometry

Related Questions

• For a man, the angle of elevation of the highest point of the temple situated east of him is 60°. On walking 240 metres to north, the angle of elevation is reduced to 30°, then the height of the temple is

  ---

• In $\Delta ABC,\left( \cot \frac{A}{2}+\cot \frac{B}{2} \right)\,\left( a{{\sin }^{2}}\frac{B}{2}+b{{\sin }^{2}}\frac{A}{2} \right)$ =

  ---

• The angle of elevation of the top of a tower from the top of a house is 60° and the angle of depression of its base is 30°. If the horizontal distance between the house and the tower be 12 m, then the height of the tower is

  ---

• If $\cos \theta =\frac{1}{2}\left( a+\frac{1}{a} \right),$then the value of $\cos 3\theta $is

  ---

• If $\cos 3x+\sin \left( 2x-\frac{7\pi }{6} \right)=-2$, then $x=$ (where $k\in Z$)

  ---