सिद्ध कीजिए कि
`cos 3A+cos 5A+cos 7A+cos 15A=4 cos 4A cos 5A cos 6A`

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

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

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

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

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

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 A+cos3A+cos5A+cos7A=4cos A cos2A cos4A

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.

Prove that: \ cos A+cos3A+cos5A+cos7A=4cos A cos2A cos4A

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