trigonometry

Related Questions

• In a triangle $ABC$ , right angled at C, the value of $\tan A+\tan B$ is

  ---

• In a triangle $ABC$ , $\frac{2\cos A}{a}+\frac{\cos B}{b}+\frac{2\cos C}{c}=$ $\frac{a}{bc}+\frac{b}{ca}$ , then the value of angle A is

  ---

• In a $\Delta ABC,\ {{r}_{1}} < {{r}_{2}} < {{r}_{3}},$then

  ---

• The angle of elevation of a cliff at a point A on the ground and a point B, 100 m vertically at A are $\alpha$ and $\beta$ respectively. The height of the cliff is

  ---

• In $\Delta ABC$ , ${{a}^{2}}({{\cos }^{2}}B-{{\cos }^{2}}C)+$ ${{b}^{2}}({{\cos }^{2}}C-{{\cos }^{2}}A)+$ ${{c}^{2}}({{\cos }^{2}}A-{{\cos }^{2}}B)=$

  ---