若tana+1/tana=10/3,a属于(π/4,π/2),则sin(2a+π/2)的值为A-根号2/10 B根号2/10 C5根号2/10 D7根号2/10你答案算错了应该选D
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![若tana+1/tana=10/3,a属于(π/4,π/2),则sin(2a+π/2)的值为A-根号2/10 B根号2/10 C5根号2/10 D7根号2/10你答案算错了应该选D](/uploads/image/z/5500830-30-0.jpg?t=%E8%8B%A5tana%2B1%2Ftana%3D10%2F3%2Ca%E5%B1%9E%E4%BA%8E%EF%BC%88%CF%80%2F4%2C%CF%80%2F2%EF%BC%89%2C%E5%88%99sin%282a%2B%CF%80%2F2%29%E7%9A%84%E5%80%BC%E4%B8%BAA-%E6%A0%B9%E5%8F%B72%2F10+B%E6%A0%B9%E5%8F%B72%2F10+C5%E6%A0%B9%E5%8F%B72%2F10+D7%E6%A0%B9%E5%8F%B72%2F10%E4%BD%A0%E7%AD%94%E6%A1%88%E7%AE%97%E9%94%99%E4%BA%86%E5%BA%94%E8%AF%A5%E9%80%89D)
若tana+1/tana=10/3,a属于(π/4,π/2),则sin(2a+π/2)的值为A-根号2/10 B根号2/10 C5根号2/10 D7根号2/10你答案算错了应该选D
若tana+1/tana=10/3,a属于(π/4,π/2),则sin(2a+π/2)的值为
A-根号2/10 B根号2/10 C5根号2/10 D7根号2/10
你答案算错了应该选D
若tana+1/tana=10/3,a属于(π/4,π/2),则sin(2a+π/2)的值为A-根号2/10 B根号2/10 C5根号2/10 D7根号2/10你答案算错了应该选D
tana+1/tana=sina/cosa+cosa/sina=[(sina)^2+(cosa)^2]/sinacosa=1/[1/2*2sinacos]
=2/sin2a=10/3
sin2a=3/5
π/4π/2<2a<π
所以cos2a<0
因为(sin2a)^2+(cos2a)^2=1
所以cos2a=-4/5
sin(2a+π/2)=cos2a=-4/5
已知3π/4小于a小于π,tana+1/tana=-10/3,求tana,
已知3π/4<a<π ,tana+1/tana=-10/3 则tana=
tan²a-2tana-3=0.tana=3或tana=-1
1+tanA/1-tanA=3+2.828 tanA=
1+tana/1-tana=-3
若COSa=-3/5,且tana>0,则(tana.cos^3a)/(1-sina)=
若tana+1/tana-1=3且a为锐角,则sina=?
若1-tanA / 1+tanA=2+√3,则cot(45°+A)等于?
若1-tanA/1+tanA=2+√3,cot(4/π+A)=
已知tan 3a = 3tana - (tana)^3 / 1-3 (tana)^2 求最小正a使tan3a=1/tana
若锐角A满足tanA+1/(tanA)=3,则tan^2A+1/(tan^2A)=?
tanA=-1,A=?
sin^2A+cos^2A/sinAcosA=-10/3怎么得到 tanA+1/tanA=-10/3
怎么证tan(45+a)=(1+tana)/(1-tana).
求证tan(a+π/4)=(1+tana)/(1-tana)
tan(a+b)-1/tana=2*tana 请化简!
求证tan(A/2)-{1/(tanA/2)}=-2/tanA
求证tan(a/2)-1/(tana/2)=-2/tana