SOLUTION: Determine the exact value of the trigonometric functions listed below. cot (135) = is it -1? cos(pi/12)....where do I start?

Question 84895: Determine the exact value of the trigonometric functions listed below.
cot (135) = is it -1?
cos(pi/12)....where do I start?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

So you are correct

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Break up the argument. Note:

Now use the trig identity:

Plug in and

Now using the unit circle, we get , , , and

Substitute each trig function with it's corresponding expression

Multiply

Combine the fractions

So

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