if cos²a-sin²a=1÷√3,then cos⁴a-sin⁴a= what?
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Answer:
cos^2a-sin^2a=1/√3=√3/3
cos^4a-sin^4a
=(cos^2a+sin^2a)(cos^2a-sin^2a)
=1×√3/3
=√3/3
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