[" 8.TCOS aconiza alal'd क6: "],[[" (i) "cos2A+cos4A+cos6A+cos8A," (4) "4sin A],[=,4cos A cos2A cos5A]]

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

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

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

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

cos4A=1-8cos^(2)A+8cos^(4)A

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=4cos4Acos5Acos6A .

cos^6A-sin^6A=cos2A(1-1/4sin^2 2A)

showthat::(cos8A cos5A-cos12A cos9A)/(sin8A cos5A+cos12A sin9A)=tan4A

Prove that: (cos8A cos5A-cos12A cos9A)/(sin8A cos5A+cos12A sin9A)=tan4A