Hi!

How do you prove that tan(∅+Φ) = (tan ∅ + tan Φ)/ (1- tanΦtan∅)?

I'm able to prove the formulas for sin and cos (∅+Φ) but when i use sin/ cos = tan, it doesnt give me the above formula..

thanks

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- Oct 23rd 2009, 01:06 PMalexandrabel90addition theorems
Hi!

How do you prove that tan(∅+Φ) = (tan ∅ + tan Φ)/ (1- tanΦtan∅)?

I'm able to prove the formulas for sin and cos (∅+Φ) but when i use sin/ cos = tan, it doesnt give me the above formula..

thanks - Oct 23rd 2009, 01:29 PMadkinsjr
- Oct 23rd 2009, 01:30 PMtonio