1 |
3 |
∴sinθ=-
1 |
3 |
原式=
?cosθ |
cosθ(?cosθ?1) |
cos(2π?θ) | ||
?sin(
|
=
1 |
1+cosθ |
cosθ |
?cos2θ +cosθ |
1 |
1+cosθ |
1 |
1?cosθ |
2 |
1?cos2θ |
2 |
sin2θ |
2 | ||
(?
|
1 |
3 |
cos(π+θ) |
cosθ[cos(π?θ)?1] |
cos(θ?2π) | ||||
sin(θ?
|
1 |
3 |
1 |
3 |
?cosθ |
cosθ(?cosθ?1) |
cos(2π?θ) | ||
?sin(
|
1 |
1+cosθ |
cosθ |
?cos2θ +cosθ |
1 |
1+cosθ |
1 |
1?cosθ |
2 |
1?cos2θ |
2 |
sin2θ |
2 | ||
(?
|