作业帮cos(a+b)=-1,tan a =2 cot b=?
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cos(a+b)=-1,tan a =2 cot b=?
cos(a+b)=-1,tan a =2 cot b=?
cos(a+b)=-1,tan a =2 cot b=?
cos(a+b)=-1,
sin(a+b)=0
tan(a+b)=0
tan(a+b)=(tana+tanb)/(1-tanatanb)=0
tana+tanb=0
2+tanb=0
tanb=-2
cotb=-1/2
cos(a+b)=-1
sin(a+b)=0
tan(a+b)=0
tan(a+b)=(tana+tanb)/(1-tanatanb)=0
tana+tanb=0
tana=2
tanb=-2
cotb=-1/2