sin(a+b)=2/3,sin(a-b)=负1/5,求tana/tanb=
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/19 09:40:58
xQ;n@
%^o(ddX "jE"hEc|f$yofEøR=m[24ݧ{w68/ԘOu|`FE%ZO5EU0f8tXL#]d2_߳rU>כ.[rՍ . i>F=rAmOuFFBbeh%ׄs01+rK#tQ:~A/
sin(a+b)=2/3,sin(a-b)=负1/5,求tana/tanb=
sin(a+b)=2/3,sin(a-b)=负1/5,求tana/tanb=
sin(a+b)=2/3,sin(a-b)=负1/5,求tana/tanb=
sin(A+B)=sinAcosB+sinBcosA=2/3 ;sin(A-B)=sinAcosB-sinBcosA=-1/5
所以:sinAcosB=7/30(上面两式相加再除2) ,sinBcosA=13/30(上面两式相减再除2).两个再相除:tanA*cotB=7/13.则:tanA/tanB=7/13.
sin(a+b)=sinacosb+cosasinb=2/3,
sin(a-b)=sinacosb-cosasinb=-1/5
sinacosb=7/30
cosasinb=13/30
tanacotb=7/13
tana/tanb=7/13
3 在三角形ABC中,已知(a2+b2)sin(A-B)=(a2-b2)sin(A+B) 求证:ABC是等腰或直角三角形(a^2+b^2)sin(A-B)=(a^2-b^2)sin(A+B),(sin^A+sin^B)sin(A-B)=(sin^A-sin^B)sin(A+B) sin^A*(sin(A+B)-sin(A-B))=sin^B*(sin(A-B)+sin(A+B)) sin^A*2c
证明sin(a+b)sin(a-b)=sin^2 a-sin^2 b,
求证:sin(a+b)sin(a-b)=sin^2a-sin^2b
【证明】Sin A+sin B=2Sin 22
已知sin(a)=2sin(b)求sin(a/2)/sin(b/2)的值.
已知3SIN^2A+2SIN^2B=5SINA,求SIN^2A+SIN^2B范围
证明sina sin(a+2b) - sinb sin(b+2a) =sin(a+b)sin(a-b)
懂得进.证明,sina+sin(a+b)+sin(a+2b)+...sin(a+nb)=sin(a+ab/2)sin[(n+1)b/2]/sin(b/2)
3sin(a)^2+2sin(b)^2=1,3sin(a)=2sin(b),a,b都为锐角,求a+2b的值是3sin(2a)=2sin(2b),
已知3sin b=sin(2a+b) 求证tan(a+b)=2tana
如何证明sin(a+b)sin(a-b)=sin*a-sin*b (*为平方)
求证恒等式sin(A+B)sin(A-B)=sin²A-sin²B
sin a-sin b等于
证明 sin^2A+sin^2B-sin^2A*sin^2B+cos^2A*cos^2证明 sin^2A+sin^2B-sin^2A*sin^2B+cos^2A*cos^2B=1
已知 3sin A = sin (2B +A ),求证 : tan(A+B)= 2tanB
设A,B为锐角,且sin^2A+sin^B=sin(A+B),求证A+B=90sin^2A+sin^2B=sin(A+B)sin^2A表示sinA的平方
求证(a^2+b^2-c^2)/(b^2+c^2-a^2)=(sin(A+B)+sin(A-B))/(sin(A+B)-sin(A-B))
sin(a+b)=根号3/2,求a+b?