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8sin(45+a)sin(45-a)=1,sin^4a-cos^4a=
sin(45度+a)=
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cosA+cos^2A=1,sin^2A+sin^4A+sin^8A
sin(a-15)=-sin(15-a)?
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sin²A=
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sin(arccos(2sin(a)))=
sin(a)=5/13.a+b=45度,求sin(b).如题.
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当a=45度,sin a_______cos a当a<45度,sin a_______cos a当a>45度,sin a_______cos a
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