#1:

Isolate cos(x):

Now I'm sure you've gone what values of x would work to solve the last line.

#2:

In that last line, I basically took the cosine of both sides. You would need a calculator for this as I doubt you know the exact value of .

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- August 14th 2008, 02:37 PM #1

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## Please help

I am taking pre-cal at our local college and have my final on monday. The teacher gave us a study guide but I am having a few problems and need some help please. I am stuck on these two problems:

solve algebraically between [0,2pie]

2cosx +Sq. root2=0

other problem: solve for x

arccos x- arccot6/5=0

Can someone please show me how to work these. I am sure we went over it in class but I am lost. Thank you

- August 14th 2008, 02:51 PM #2

- August 14th 2008, 05:06 PM #3

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