Posted by **emergency!!! please help!** on Monday, February 11, 2013 at 1:27am.

It is given that sin(θ)=15√. In addition, a and b are coprime positive integers such that cos(2θ)=ab. What is the value of a+b?

- trigonometry -
**drwls**, Monday, February 11, 2013 at 2:33am
Your statement sin()=15

doesn't make sense.

- trigonometry -
**Louie**, Monday, February 11, 2013 at 2:35am
^Yeah theta has to be in degrees, or radians. Sq rt of 15 can't be right

- trigonometry -
**drwls**, Monday, February 11, 2013 at 2:38am
If you are trying to write sqrt(15), write it as 15, not 15.

A sine can not exceed 1, buy the way

- trigonometry -
**stenardt**, Tuesday, February 12, 2013 at 6:43am
may this be correct question

It is given that sin(θ)=1/√5. In addition, a and b are coprime positive integers such that cos(2θ)=a/b. What is the value of a+b?

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