Ah, I've always sucked at doing proofs, so I'd like help with these two;
Prove that
Prove that
Sorry that I haven't shown my beginning steps, I'll work on it while I wait for a response. Thanks in advance for any help
Wow! Thanks guys! Lots of smart people from Austrailia! I really appreciate the help, but Gusbob, the second one doesn't look right to me;
I don't see how
Doesn't ? And even if I'm being stupid and you are right, I'm suppose to transform the it into not 1. (I'm so sorry if I sound too harsh or ungrateful, I just want makes sure it's right D: )
Anywho, here's what I got, does this look right?
Given
Swapping the sides around
Simplify by multiplying
Reciprocal Identity
Pythagorean Identity
TAH-DAH~
Also, here's two other question I'd like to double check;
Find the exact value of cos 105° without using tables or a calculator.
(Using the addition formula for cosine)
Is that right?
And, "Find the exact value of tan 15° without using tables or a calculator."
(Using a Half-Angle formula for the tangent)
_______
....
=
BTW How do you put subordinate fractions using the math bbcode? That was the only way I could think to do it.