(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(2)在Rt△ABC中,∠C=90°,BC=2AC,则sinA=_____,sinB=_____,tanA=_____.(3)在Rt△ABC中,∠C=90°,且CD⊥AB,CD
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![(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(2)在Rt△ABC中,∠C=90°,BC=2AC,则sinA=_____,sinB=_____,tanA=_____.(3)在Rt△ABC中,∠C=90°,且CD⊥AB,CD](/uploads/image/z/1786872-48-2.jpg?t=%281%29%E5%9C%A8Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0C%3D90%C2%B0%2CAB%3D4%2CBC%3D3%2C%E5%88%99sinA%3D_____%2CcosA%3D_____.%EF%BC%881%EF%BC%89%E5%9C%A8Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0C%3D90%C2%B0%2CAB%3D4%2CBC%3D3%2C%E5%88%99sinA%3D_____%2CcosA%3D_____.%EF%BC%882%EF%BC%89%E5%9C%A8Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0C%3D90%C2%B0%2CBC%3D2AC%2C%E5%88%99sinA%3D_____%2CsinB%3D_____%2CtanA%3D_____.%EF%BC%883%EF%BC%89%E5%9C%A8Rt%E2%96%B3ABC%E4%B8%AD%2C%E2%88%A0C%3D90%C2%B0%2C%E4%B8%94CD%E2%8A%A5AB%2CCD)
(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(2)在Rt△ABC中,∠C=90°,BC=2AC,则sinA=_____,sinB=_____,tanA=_____.(3)在Rt△ABC中,∠C=90°,且CD⊥AB,CD
(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.
(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.
(2)在Rt△ABC中,∠C=90°,BC=2AC,则sinA=_____,sinB=_____,tanA=_____.
(3)在Rt△ABC中,∠C=90°,且CD⊥AB,CD=4,BD=3,则sinB=_____.
(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(1)在Rt△ABC中,∠C=90°,AB=4,BC=3,则sinA=_____,cosA=_____.(2)在Rt△ABC中,∠C=90°,BC=2AC,则sinA=_____,sinB=_____,tanA=_____.(3)在Rt△ABC中,∠C=90°,且CD⊥AB,CD
(1)sinA=3/4 cosA=(√ 7)/4
(2)sinA=1/2 sinB=(√ 3)/2 tanA=(√ 3)/3
(3)sinB=4/5
(1)3/4 √/4
(2)2/√5 1/2 2
(3)16/25
在Rt△ABC中,AC=BC,∠C=90°,∠A=45° cosA=cos45°=根号2/2 当AB=4时, BC=AB*cos45°=2根号2