3 |
4 |
A.0°<∠A<30° | B.30°<∠A<45° | C.45°<∠A<60° | D.60°<∠A<90° |
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2 |
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2 |
3 |
4 |
A.
| B.
| C.
| D.
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1 |
8 |
A.
| B.-
| C.
| D.±
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A.在Rt△ABC中,若tanA=
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B.在△ABC中,若a=3,b=4,则tanA=15 | ||||
C.在Rt△ABC中,∠C=90°,则sin2A+sin2B=1 | ||||
D.tan75°=tan(45°+30°)=tan45°+tan30°=1+
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3 |
3 |
A.30°≤β≤60° | B.30°<β≤60° | C.30°≤β<60° | D.β<30° |
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