Ответ:
Объяснение:
cos2a=1-2sin²a
cos4a=1-2sin²2a
√(0,5-0,5cos4a)=√(0,5(1-cos4a))=√(0,5(1-(1-2sin²2a)))=
=√(0,5(1-1+2sin²2a))=√(0,5*2sin²2a)=√sin²2a=Isin2aI
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Ответ:
Объяснение:
cos2a=1-2sin²a
cos4a=1-2sin²2a
√(0,5-0,5cos4a)=√(0,5(1-cos4a))=√(0,5(1-(1-2sin²2a)))=
=√(0,5(1-1+2sin²2a))=√(0,5*2sin²2a)=√sin²2a=Isin2aI