`cos3A+cos5A+cos7A+cos15A`=`4cos4Acos5Acos6A`

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

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

Prove that: (cos3A+2cos5A+cos7A)/(cos A+2cos3A+cos5A)=(cos5A)/(cos3A)

Prove that: (cos4A+2cos5A+cos7A)/(cos A+2cos3A+cos5A)=(cos5A)/(cos3A)

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

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

Show that (cos8Acos5A-cos12Acos9A)/(sin8Acos5A+cos12Asin9A)=tan4A

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