`cot3A + cos 5A + cos 7A + cos 15A = 4 cos 4A cos5A cos6A`

If : cos 3 A + cos 5 A + cos 7 A + cos 15 A = 4 cos mA * cos n A * cos pA, then , the values of m, n, p are A)2,3,4B)3,4,5C)4,5,6D)5,6,7

Prove that (cos 3A +2 cos 5 A + cos 7A)/( cos A + 2 cos 3 A + cos 5A) = cos 2 A - sin 2 A tan 3 A.

cot3A+cos5A+cos7A+cos15A=4cos4A cos5A cos6A

Prove that: cos3A+cos5A+cos7A+cos 15 A=4cos4A cos5A cos6A

cos3A+cos5A+cos7A+cos15A=4cos4A cos5A cos6A

Prove the following identities : cos2 A + cos 4A + cos 6A + cos8A =4 cosA cos 2 A cos 5 A

Prove that: cos3A+cos5A+cos7A+cos15A=4cos4A cos5A cos6A

( sin 4 A sin 3A - sin 5A sin 2A+ sin 7A sin 4A )/(cos 2A cos 3A - cos 2A * cos 7A + cos A * cos 10A )=

Show that (cos 8 A cos 5A - cos 12 A cos 9A )/( sin 8 A cos 5A + cos 12 A sin 9A ) = tan 4A

Prove that, cos3A+cos5A+cos7A+cos15A=4cos4Acos5Acos6A .