trigonometry

Related Questions

• If $A+B+C=\pi ,$then $\cos \,\,2A+\cos \,\,2B+\cos \,\,2C=$

  ---

• If $\sec x\cos 5x+1=0$, where $0<x<2\pi $, then $x =$

  ---

• If $3({{\sec }^{2}}\theta +{{\tan }^{2}}\theta )=5$, then the general value of $\theta $ is

  ---

• If $x=y\cos \frac{2\pi }{3}=z\cos \frac{4\pi }{3}$, then $xy+yz+zx=$

  ---

• The area of a $\Delta ABC$ is equal to

  ---