trigonometry

Related Questions

• A balloon is observed simultaneously from three points A, B and C on a straight road directly under it. The angular elevation at B is twice and at C is thrice that of A. If the distance between A and B is 200 metres and the distance between B and C is 100 metres, then the height of balloon is given by

  ---

• If $\tan \alpha ={{(1+{{2}^{-x}})}^{-1}},$ $\tan \beta ={{(1+{{2}^{x+1}})}^{-1}}$, then $\alpha +\beta $ equals

  ---

• If ${{\sin }^{2}}\theta -2\cos \theta +\frac{1}{4}=0,$then the general value of $\theta $is

  ---

• If $\sin A=\sin B$and $\cos A=\cos B,$then

  ---

• If $\cos \theta =\frac{8}{17}$ and $\theta $ lies in the 1st quadrant, then the value of $\cos (30{}^\circ +\theta )+\cos (45{}^\circ -\theta )+\cos (120{}^\circ -\theta )$ is

  ---