cos(a+b)=-1,tan a =2 cot b=?

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cos(a+b)=-1,tana=2cotb=?cos(a+b)=-1,tana=2cotb=?cos(a+b)=-1,tana=2cotb=?cos(a+b)=-1,sin(a+b)=0tan(a+

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