Show that `sin A= (sin 3A) /(1+2 cos 2A)`. Hence find the value of `sin 15^(@).`

Show that CosA=(Cos3A)/(2Cos2A-1) . Hence find the value of Cos15^(@)

S.T tan alpha =(sin 2 alpha )/(1+cos 2 alpha ) . Hence find the value of tan 15^(@) and tan 22 1//2^(@)

Using the formula of sin(A-B)=sin A cos B-cos A sin B find the value of sin15^(@)

Prove that sin theta=(sin3 theta)/(1+2cos2 theta) and hence deduce the value of sin15^(@)

Given that sin A = 3/5 and that A is an acute anlge, find without using talbes, the values of sin 2 A , cos 2 A and tan 2A. Hence find the value of sin 4A.

If sin A = cos A , find the value of 2tan^(2)A + sin^(2)A +1 .

If sin A+cos2A=1//2 and cos A+sin2A=1//3 . Then find the value of sin 3A .

If sin A+cos2A=1//2 and cos A+sin2A=1//3 . Then find the value of sin 3A .

If sin A+cos2A=1//2 and cos A+sin2A=1//3 . Then find the value of sin 3A .