2π |
ω |
又由fmin(x)=-2可得A=2
∵f(x)的最低點(diǎn)為M(
2π |
3 |
∴sin(
4π |
3 |
∵0<φ<
π |
2 |
∴
4π |
3 |
4π |
3 |
3π |
2 |
∴
4π |
3 |
3π |
2 |
∴φ=
π |
6 |
∴f(x)=2sin(2x+
π |
6 |
(2)∵0≤x≤
π |
12 |
π |
6 |
π |
6 |
π |
3 |
∴當(dāng)2x+
π |
6 |
π |
6 |
π |
6 |
當(dāng)2x+
π |
6 |
π |
3 |
π |
12 |
π |
3 |
3 |
π |
2 |
2π |
3 |
π |
12 |
2π |
ω |
2π |
3 |
4π |
3 |
π |
2 |
4π |
3 |
4π |
3 |
3π |
2 |
4π |
3 |
3π |
2 |
π |
6 |
π |
6 |
π |
12 |
π |
6 |
π |
6 |
π |
3 |
π |
6 |
π |
6 |
π |
6 |
π |
6 |
π |
3 |
π |
12 |
π |
3 |
3 |