(cos⁴A-sin⁴A) is equal to
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2
Answer:
Cos^2(2A).
@Bblegend
Answered by
1
Answer:
cos^4A - sin^4A= (cos^2a)^2 - (sin^2a)^2
= (cos^2A-sin^2A)(cos^2A+sin^2A)
=cos^2A-sin^2A(1) (using indentity sin^2a +cos^2a=1)
=cos^2A-(1-cos^2A) (using indentity sin^2a +cos^2a=1)
=2cos^2A-1
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