trigonometry

Related Questions

• If $\cos A=\cos B\,\,\cos C$and $A+B+C=\pi ,$ then the value of $\cot \,B\,\cot \,C$ is

  ---

• If $\sin A+\sin B=C,\cos A+\cos B=D,$then the value of $\sin (A+B)=$

  ---

• A flag-staff of 5 m high stands on a building of 25 m high. At an observer at a height of 30 m. The flag-staff and the building subtend equal angles. The distance of the observer from the top of the flag-staff is

  ---

• In a triangle $ABC,$ $a=4,b=3$ , $\angle A={{60}^{o}}$. Then c is the root of the equation

  ---

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

  ---