$\,\,1(i).$ Prove that, $\,\frac{\sin3\theta-\sin\theta}{\cos\theta-\cos3\theta}=\cot2\theta$ Sol. $\,\,\frac{\sin3\t…

In the previous article , we have discussed Short Ans Type Questions (from Question No.6 to 8)of the Chapter : TRANSF…

$\,6(i)\,$ Prove that, $\,\,\cos\theta\cos(60^{\circ}-\theta)\cos(60^{\circ}+\theta)=\frac14\cos3\theta$ Sol.  $\,\,\co…

$\,3(i)\,$ Prove that $\,\,\sin19^{\circ}+\sin41^{\circ}+\sin83^{\circ}=\sin23^{\circ}+\sin37+\sin79^{\circ}$ Sol. $\,…

$\,1(i).\,$ Prove that $\,\,\sin\alpha+\sin(120^{\circ}+\alpha)+\sin(240^{\circ}+\alpha)=0$ Sol. $\,\,\sin\alpha+\sin…

$\,6.\,$ If $\,\,A+B+C=\pi,\,\,\sin(A+\frac C2)=n\sin\frac C2,\,\,$ show that, $\,\tan\frac A2\tan \frac B2=\frac{n-1…

Prove the following identities :  $\,1(i).\,\,\,\sin10^{\circ}\sin 50^{\circ}+\sin50^{\circ}\sin250^{\circ}\\+\sin250…