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anonymous
 4 years ago
Express each of the following in terms of a reference angle. Explain, please.
1a. sin 45º 1b. 135º 1c. sin 225º 1d. sin 315º
3a. cos 224.5º 3b. cos 658º 3c. 145.7º 3d. sin (201º)
anonymous
 4 years ago
Express each of the following in terms of a reference angle. Explain, please. 1a. sin 45º 1b. 135º 1c. sin 225º 1d. sin 315º 3a. cos 224.5º 3b. cos 658º 3c. 145.7º 3d. sin (201º)

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0what is reference angle for you?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I'm not really sure... I think that's the problem.

Mertsj
 4 years ago
Best ResponseYou've already chosen the best response.0The reference angle is the angle the terminal side of the angle makes with the x axis.

Mertsj
 4 years ago
Best ResponseYou've already chosen the best response.0But you have to be careful about your signs. For example the sin225=sin45 because the sin (which is like y) is positive in the first quadrant but negative in the 3rd and 4th quadrants.

Mertsj
 4 years ago
Best ResponseYou've already chosen the best response.0sin135=sin45 since sin is positive in quadrants 1 and 2

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0and in simple terms the reference angle is the acute version of the angle.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0So, for instance, number 1a, I'd just find the sine of 45º because the reference angle of 45 º is 45º, right? And for number 1b, 135º's reference angle is 45º degrees as well, so i'd find the sine of 45º... I guess I still don't fully understand how to know whether its positive or negative. In the pictures, would it be positive or negative based on where the degree of a circle ended? Sorry if I'm a little slow! I'm only in eighth grade, but i'm taking classes at the university:/
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