已知sin(π/4 +α)=(根号3)/2,则sin(3π/4 - α)值为 A.1/2 B.— 1/2 C (根号3)
1个回答
已知sin(π/4 +α)=(根号3)/2,
则sin(3π/4 - α)值
=sin[π-(3π/4 - α)]
=sin(π/4 +α)
=(根号3)/2
应选择 C (根号3)/2
相关问题
已知α∈(3π/2,2π),化简根号1-sinα+根号1+sinα 已知α∈(3π/2,2π),化简根号1-sinα+根
三角函数已知sin(π/4+3α)sin(π/4-3α)=1/4求((1-cos2α)/sin2α-根号3)sin4α的
已知sin(π+α)=根号3/2,求sin(3/4π-α)
已知α∈(3π/2,2π),化简根号1+sinα+根号1-sinα
已知α在第四象限,且根号(1-sinα)+根号(1+sinα)=根号3 则sin(π/2+α)*cos(π/2+α)=?
已知sin(α-π/4)=根号2/4,cos(3π/4-α)的值为
sin(3π-α)=根号sinα+cosα=根号2/4.0<α<π,求-sinα-cosα的值……
已知tan(π+α)=3,则2cos(π-α)-3sin(π+α)/4sin(α+π/2)+sin(2π-α)=
已知tan(π-a)=3,求2sin(π/2-α)-3sin(π+α)/4cos(-α)+sin(2π-α)的值
已知α∈(π/2,π),且sinα=3/5,则sin^2α/2+(sin4αcos2α)/(1+cos4α)的值为多