The problem is:

cos(-7pi/12)

I used the half angle formula to get: -(sqrt(3)-1)*sqrt(2)/(4)

Somehow or another the computer system isn't taking my answer.

Thanks for the help!

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- Nov 20th 2006, 09:46 AMqbkr21Trig Problem
The problem is:

cos(-7pi/12)

I used the half angle formula to get: -(sqrt(3)-1)*sqrt(2)/(4)

Somehow or another the computer system isn't taking my answer.

Thanks for the help! - Nov 20th 2006, 09:53 AMThePerfectHacker
- Nov 20th 2006, 10:08 AMqbkr21Re:
This seems to be the same answer I got, and it still doesn't want to fit into the system...Is there another way you can express this?

Thanks! - Nov 20th 2006, 11:13 AMtopsquark
- Nov 20th 2006, 04:07 PMqbkr21Re:
Here are the directions the computer system is still not taking it:

Use a sum or difference formula or a half angle formula to determine the value of the trigonometric functions. Give exact answers. Do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2);

Thanks! - Nov 20th 2006, 04:16 PMtopsquark
- Nov 20th 2006, 09:48 PMCaptainBlack
- Nov 20th 2006, 10:32 PMqbkr21Re:
Ok thanks Captain Black