" OS Ci) "cos3A+cos5A+cos7A+cos15A=4cos4A cos5A

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 .

(cosA + cos3A + cos5A + cos7A)/(cosAcos2Acos4A)=

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

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: (sin2A sin3A-sin4A sin5A+sin3A sin6A)/(cos2A cos3A-cos4A cos5A+cos3A cos6A)=tan A tan4A

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