Find the value of (cos4A - sin4A) =
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cos^4A-sin^4A
=(cos^2A)^2-(sin^2A)^2
=(cos^2A+sin^2A)(cos^2A-sin^2A)
=1(cos^2A-sin^2A)
=cos2A
=(cos^2A)^2-(sin^2A)^2
=(cos^2A+sin^2A)(cos^2A-sin^2A)
=1(cos^2A-sin^2A)
=cos2A
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