6-(-2)=8是半个周期高中数学必修四函数y=asin,一周期就是16,所以w=2π/16=π/8
代入得:-2w+q=0,所以根据q的绝对值小于π/2,可以得出q= π/4
x=10代入:4=Asin(10*π/8+π/4)=- A
所以A= - 4
y=- 4sin(πx/8+π/4)
知函数y=Asin(wx+φ)(A>0,w>0,0
知函数y=Asin(wx+φ)(A>0,w>0,0<φ<π/2)的周期为π,且图像最低点为M(2π/3,-2) (1)求函数的解析式(2)当x属于[0,π/12]时函数的最值
(1)解析:∵函数y=Asin(wx+φ)(A>0,w>0,0<φ<π/2)的周期为π,且图像最低点为M(2π/3,-2)
∴T=π==>w=2,A=2
∴f(x)=2sin(2x+φ)==> f(2π/3)=2sin(4π/3+φ)=-2
4π/3+φ=3π/2==>φ=π/6
∴f(x)=2sin(2x+π/6)
f(x)单调增区间:2kπ-π/2<=2x+π/6<=2kπ+π/2==>kπ-π/3<=x<=kπ+π/6
∵区间[0,π/12]
f(0)=2sin(0+π/6)=1
f(π/12)=2sin(π/6+π/6)=√3
∴f(x)在区间[0, π/12]上最大值为√3,最小值为1