91Ó°ÊÓ

The value of \(\tan (180+\theta) \cdot \tan (90-\theta)\) is : (a) 1 (b) \(-1\) (c) 0 (d) none of these

A portion of a \(30 \mathrm{~m}\) long tree is broken by tornado and the top struck up the ground making an angle \(30^{\circ}\) with ground level. The height of the point where the tree is broken is equal to: (a) \(30 / \sqrt{3} \mathrm{~m}\) (b) \(10 \mathrm{~m}\) (c) \(30 \sqrt{3} \mathrm{~m}\) (d) \(60 \mathrm{~m}\)