Current Pre-Calc problems

Question

+4

853

5

+2592

So in my Pre-Calc class, we just learned some identies of sin,cos, and tan.

Just wondering if anybody else, not CPhill or Alan, knows this stuff

$(Tan\alpha +Tan\beta)/(1-Tan\alpha*Tan\beta) =$

$Cos\alpha*Cos\beta -Sin\alpha*Sin\beta = ?$

SpawnofAngel Jan 28, 2016

+2592

+5

Best Answer

I wrote that because i knew you two would know the anwser

SpawnofAngel Jan 28, 2016

SpawnofAngel · Answer 1 · 2016-01-28T08:59:47

I wrote that because i knew you two would know the anwser

Alan · Answer 2 · 2016-01-28T08:43:54

Just noticed you wrote NOT CPhil or Alan! So I've deleted my reply.

CPhill · Answer 3 · 2016-01-28T08:53:43

HAHAHA!!!!........what do you have against us???

First one ..... Tan (A + B)

Second one.........Cos (A + B)

Hayley1 · Answer 4 · 2016-01-28T09:01:00

Tha'ts funny. And yes, I know how to do that :D

Guest · Answer 5 · 2016-01-28T09:38:52

so funny XD