# SOLUTION: Use the information given about angle theta to find the exact value of cosine theta/2 sin theta=3/5 and 0<theta<pie/2

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 Question 516629: Use the information given about angle theta to find the exact value of cosine theta/2 sin theta=3/5 and 0Answer by solver91311(16897)   (Show Source): You can put this solution on YOUR website! First use the Pythagorean Identity to find . But recall , hence is a 1st quadrant angle, therefore the cosine is positive. Now use the half angle formula for cosine: But recall , hence , is also a 1st quadrant angle, therefore the cosine is positive. After rationalizing the denominator. One last thing: pie is dessert, pi is the lower case Greek letter denoting the ratio between the circumference and the diameter of a circle. John My calculator said it, I believe it, that settles it