sinAcotC+cosA |
sinBcotC+cosB |
A.(0,+∞) | B.(0,
| C.(
| D.(
|
| ||
|
sinAcosC+cosAsinC |
sinBcosC+cosBsinC |
sin(A+C) |
sin(B+C) |
sinB |
sinA |
b |
a |
| ||
2 |
| ||
2 |
| ||
2 |
| ||
2 |
3 |
1 |
2 |
1 |
2 |
3 |
4 |
A.2 | B.1 | C.
| D.
|
A.90° | B.120° | C.135° | D.150° |
| ||
2 |
a |
b |
b |
c |
b |
0 |
a |
c |
| ||
2 |
π |
2 |
A.0个 | B.1个 | C.2个 | D.3个 |
A.a+c≥b-c | B.ac>bc | C.
| D.(a-b)c2≥0 |
C |
2 |
A.等腰三角形 | B.直角三角形 | C.锐角三角形 | D.钝角三角形 |
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