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[" ta.Fare wर "],[[" (i) "cos4A=1-8cos^(2)A+8c," (Prove that) "]]

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

Show tha: cos4A=1-8cos^2A+8cos^4A .

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

Prove that cos 4A=1-8cos^2A+8 cos^4A

Prove that: cos4A=1-8cos^2\ A+8cos^4\ A

cos4 alpha=1-8cos^(2)alpha+8cos^(4)alpha

Prove that :cos4x=1-8sin^(2)x cos^(2)x

Prove that : cos 4x = 1 - 8 sin^2 x cos^2 x .

Prove that cos 4(x)=1-8 sin ^(2) (x) cos ^(2) (x)