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[" (i) "cos3A+cos5A+cos7A+cos15A=4" cos ...

[" (i) "cos3A+cos5A+cos7A+cos15A=4" cos "],[" (ii) "cos A+cos3A+cos5A+cos7A=4cos A cos2A cos4A],[A]

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

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

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

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 .

( cos A + cos 3A + cos 5A + cos 7A )/( sin A + sin 3A + sin 5A + sin 7A ) =

(cos2A cos3A-cos2A cos7A+cos A cos10A)/(sin4A sin3A-sin2A sin5A+sin4A sin7A)=cot6A cot5A