trigonometry

Related Questions

• If $\sin \theta +\cos \theta =\sqrt{2}\cos \alpha $, then the general value of $\theta $ is

  ---

• If $\sin \theta +\sin 2\theta +\sin 3\theta =\sin \alpha $ and $\cos \theta +\cos 2\theta +\cos 3\theta =\cos \alpha $, then $\theta$ is equal to

  ---

• If $x=\sec \,\varphi -\tan \varphi ,y=\text{cosec}\varphi +\cot \varphi ,$then

  ---

• The shadow of a tower is found to be 60 metre shorter when the sun’s altitude changes from ${{30}^{o}}$ to ${{60}^{o}}$. The height of the tower from the ground is approximately equal to

  ---

• ${{(\cos \alpha +\cos \beta )}^{2}}+{{(\sin \alpha +\sin \beta )}^{2}}=$

  ---