sin^4-cos^4=1-2cos^2
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3
sin^4-cos^4
=(1-cos^2)^2-cos^4
=1+cos^4-2cos^2-cos^4
=1-cos^2
please mark it as brainliest
=(1-cos^2)^2-cos^4
=1+cos^4-2cos^2-cos^4
=1-cos^2
please mark it as brainliest
Answered by
6
I think u forgot to put any variable so I considered it theta.
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