A.直角三角形 | B.等腰或直角三角形 |
C.等腰三角形 | D.等边三角形 |
a |
sinA |
b |
sinB |
sin2BsinA |
cosA |
sin2AsinB |
cosB |
π |
2 |
A.y=sinx•cosx | B.y=cos22x-sin22x | ||||
C.y=2cos2
| D.y=
|
3 |
π |
2 |
π |
6 |
1 |
2 |
π |
3 |
θ+ϕ |
2 |
θ-ϕ |
2 |
θ+ϕ |
2 |
θ-ϕ |
2 |
θ+ϕ |
2 |
θ-ϕ |
2 |
θ+ϕ |
2 |
θ-ϕ |
2 |
| ||
3 |
π |
2 |
2 |
sin2θ |
cosθ |
sinθ |
π |
2 |
π |
4 |
π |
2 |
π |
2 |
1 |
3 |
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