Find an exact value.

tan 75°

Question

Find an exact value.

tan 75°

anonymous · Answer

I got five questions wrong in my assignment and I kind of want to see where I went wrong. :) any help is very appreciated

anonymous · Answer

$75=30+45$ so this is a set up for the "addition angle formula" for tangent

anonymous · Answer

I think it may be that I didn't simplify...I chose 2 + sqrt 3
It's wrong

jdoe0001 · Answer

heheh

anonymous · Answer

hello again :) I called my teacher but she wouldn't pick up...so I thought I'd try again and see what I did wrong

anonymous · Answer

God I despise pre-calc...I miss algebra...

jdoe0001 · Answer

this one, is EXACTLY more or less to the one you did at http://openstudy.com/study#/updates/51e994d1e4b0d999840eb6ac the one there uses $\bf tan(45 - 30) = \cfrac{tan(45) - tan(30)}{1 + tan(45)tan(30)}$ this one uses $\bf tan(45 + 30) = \cfrac{tan(45) + tan(30)}{1 - tan(45)tan(30)}$ same values you'll be adding and simplifying

anonymous · Answer

What I don't about the last one is how that person got the 2 out of nowehere...how do you get that number here?

jdoe0001 · Answer

hehe,   well, what part confused you on the simplifying?

anonymous · Answer

I'm not very good at fractions...so that part of it...you cross multiplied right?

jdoe0001 · Answer

well, no that much, mainly adding and cancelling like-terms in the numerator and denominator