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Mathematics 9 Online
OpenStudy (anonymous):

WILL AWARD MEDAL AND FAN! Can someone please explain step by step how to solve this? This is using double and half angle identities.

OpenStudy (anonymous):

OpenStudy (jdoe0001):

well... so you're in quadrant I sine and cosine, that is, x and y, are both positive recall \(\bf sin(\theta)=\cfrac{5}{13}\to \cfrac{opposite}{hypotenuse}\to \cfrac{b}{c}\to \cfrac{b=5}{c=13}\) thus |dw:1404423477115:dw|

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