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What is the answer for question 8) ? http://postimg.org/image/yzcviz60z/
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a) Given `costheta=1/sqrt10`
`=3/sqrt10 ` (Note that if theta is a first quadrant angle, then the value of sintheta must be positive, so the negative root is discarded).
b) Given `tanbeta=-sqrt5/2`
`=-3/2` (Note that if beta is a second quadrant angle, then the value of cosbeta, and secbeta must be negative, so the positive root is discarded).
Posted by llltkl on July 24, 2013 at 2:19 AM (Answer #1)
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