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- January 11th 2009, 11:19 PMfayeorwhatsoeverProving Trigonometry Identities Help
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- January 11th 2009, 11:58 PMIsomorphismQuote:

And also, I'm confused about this.. is -tanx-tanx equal to -2tanx or -tan2x?

By the way -tan x -tan x = -2 tan x

I will answer your question, but I doubt you will understand every step clearly. First read the identities and know them clearly and then re read my post, you will understand the solution.

For the first equality, I have used the relation

For the second equality I have used