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DebbieG
 one year ago
Best ResponseYou've already chosen the best response.0I guess you mean: sin(90)= ? sin(60)= ? sin(45)= ? It kind of depends on what methods you have covered. If your teacher is stressing the unit circle, then those are on there, so you would look at the ycoordinate of each point of intersection with the circle. Alternatively, for 90 you have a quadrantal angle. since \(\sin\alpha=y/r\) then you have to notice that, for any point on the negative side of the yaxis, y/r=1. For the other two, those are not quadrantal so I would use their reference angles to find the function values. Sine is negative in Q4, so you have: sin(60)=sin(60) And sin(45)=sin(45) For sin(60) and sin(45) then, you could use SOHCAHTOA with the appropriate "special triangle": dw:1380883307004:dw
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