sin2a=1/3 a∈(π/4,3/4π)则tana=?
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/19 13:32:44
sin2a=1/3a∈(π/4,3/4π)则tana=?sin2a=1/3a∈(π/4,3/4π)则tana=?sin2a=1/3a∈(π/4,3/4π)则tana=?解析:已知a∈(π/4,3/4π
sin2a=1/3 a∈(π/4,3/4π)则tana=?
sin2a=1/3 a∈(π/4,3/4π)则tana=?
sin2a=1/3 a∈(π/4,3/4π)则tana=?
解析:
已知a∈(π/4,3/4π),那么:2a∈(π/2,3π/2)
又sin2a=1/3>0,所以:2a∈(π/2,π)
那么:cos2a=-根号(1-sin²2a)=-(2根号2)/3
所以:tana=(1-cos2a)/sin2a=(1+2根号2/3)÷(1/3)=3+2根号2
若a∈(5π/4,3π/2),化简√(1+sin2a)+√(1-sin2a)=
若a∈(5π/4,3π/2),化简:根(1+sin2a)+根(1-sin2a)的结果为( )
已知sin(a+π/4)=1/3,a∈(π/2,π)则sin2a=
sin2a=1/3 a∈(π/4,3/4π)则tana=?
tan(7π-a)=3/4 ,则sin2a=
tan(π/4+a)=3,求sin2a-2cos2a
已知tan(派/4+a)=3,计算:(1)tana;(2)(sin2a+3cos2a)/(5cos2a-3sin2a)
已知tan(π/4+已知tan (π/4+a)=3 求 sin2a-2cos^2a-1的值我已经算出tana=1/2还有sin2a-cos2a-1化简为sin2a-cos2a-1-1
sin2a =3/5 (-3π/4
1.已知sin2a=3/4,π
tana=-1/3 (2sin^a+sin2a)/cos(a-π/4)=?-π/2
tan(a+π/4)=3+2倍根号2,则1-cos2a/sin2a=
有好评, tan(π/4-A)=3,则cos2A/(1+sin2A)=
已知tan(a+π|4)=3+2根号2,求1-cos2a|sin2a
1-sin2a-cos^2(a-π/4)
证明 (3sin2a-4cos2a)/(2tana-1)-sin2a=4cosa^2
cos(a-π/4)=1/4,则sin2a
已知tan(a+派/4)=3,则sin2a=?