if Cos(30) is then the numerator is
The 1 can be written as 2/2 and then you can factor out 1/2.
The answer you give seems to be wrong... it should have a 1/2 in the numerator under the root.
Okay, so I'm doing a TON of identities in trig, and have come to a point where I'm working on problems such as:
cos of 30 is
I've forgotten what it's called but I need a step by step guide to simplifying this! (it simplifies down to an exact answer of
Edit: Yes, I've done college algebra (and aced it) but I haven't had to simplify problems like this in about 6 or 7 months, so I've lost the skill!
Okay, so the problem is 'find the exact value of cos 15 degrees using hte half angle identity for cosine'
The example gets down to ( I think i typed it wrong) a point where it is:
The square root of (1 plus the square root of three over two) all over the square root of two.
The final answer is the square root (two plus the square root of three) all over two.
That clear it up any?