高一数学三角函数问题（能答几个答几个,1.若α∈(-π/2,0)且sin(π-α)=log8 1/4,则tan(2π-α)等于?2.已知sin(α-π/4)=1/3,则cos(π/4+α)的值等于?3.若sin(π/4+α)=根号3/2,则sin(3π/4-α)的值为?4.tan(3π+α)=M,[sin(α-3π)+cos(π-α)]/[sin(-α)-cos(π+α)]的值?5.设f(x)=asin(πx+α)+bcos(πx+β),其中abαβ都是非零实数,如果f(2009)=1,则f(2010)=
2019-06-25
高一数学三角函数问题（能答几个答几个,
1.若α∈(-π/2,0)且sin(π-α)=log8 1/4,则tan(2π-α)等于?
2.已知sin(α-π/4)=1/3,则cos(π/4+α)的值等于?
3.若sin(π/4+α)=根号3/2,则sin(3π/4-α)的值为?
4.tan(3π+α)=M,[sin(α-3π)+cos(π-α)]/[sin(-α)-cos(π+α)]的值?
5.设f(x)=asin(πx+α)+bcos(πx+β),其中abαβ都是非零实数,如果f(2009)=1,则f(2010)=?
优质解答
1 2√5/5
2 1/3
3 根号3/2
4 (M+1)/(M-1)
5 -1
1 2√5/5
2 1/3
3 根号3/2
4 (M+1)/(M-1)
5 -1