Droopy hates identities

[Azmain S. Raiyan]

If,
cotA+cotB+cotC=0

Then how the heck am I supposed to show that,
(ΣtanA)²=Σtan²A

(pls explain it to me like I'm a dummy)

 

[Deleted member 4993]

If,
cotA+cotB+cotC=0

Then how the heck am I supposed to show that,
(ΣtanA)²=Σtan²A

(pls explain it to me like I'm a dummy)

Please tell us:

How do you interpret: ΣtanA

Please show us what you have tried and exactly where you are stuck.

Please follow the rules of posting in this forum, as enunciated at:

READ BEFORE POSTING

Please share your work/thoughts about this problem.

 

[Steven G]

No one here will explain the problem to you as we want you to learn from this experience. We want you to solve your problem with hints from us.

Now before we can help you we need to know what you are confused about. What do you think that ΣtanA means?