trigonometry
posted by emergency!!! please help! on .
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?

Your statement sin(ƒÆ)=15ã
doesn't make sense. 
^Yeah theta has to be in degrees, or radians. Sq rt of 15 can't be right

If you are trying to write sqrt(15), write it as ã15, not 15ã.
A sine can not exceed 1, buy the way 
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?