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(2003•滨州)若cos(36°-A)=,则sin(54°+A)的值是( ) ...
(2003•滨州)若cos(36°-A)=
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,则sin(54°+A)的值是( )
A.
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B.
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C.
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D.
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,那么sinB的值是( )
A.
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B.
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C.
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,则
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等于( )
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C.
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(2003•大连)在Rt△ABC中,∠C=90°,AC=4,BC=3,则cosB的值为( )
A.
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C.
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D.
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(2003•甘肃)在Rt△ABC中,∠C=90°,AB=10,AC=6,则cosA的值等于( )
A.
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B.
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C.
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C.tanB=
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D.cotB=
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