SOLUTION: if a is in the third quadrant and cosa=15/17, find the value of cosa/2.

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Question 1150482: if a is in the third quadrant and cosa=15/17, find the value of cosa/2.
Answer by ikleyn(52814) About Me  (Show Source):
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if a is in the third quadrant and cosa=15/17, find the value of cosa/2.
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If  "a"  is in the third quadrant,  then cos(a)  CAN  NOT  be equal to  15%2F17.