trigonometry is a very i n t e r e s t i n g subject, but my math teacher said that it's the main thing that "murders" high school students' grades and self-esteem. It's a good idea to start getting the concepts when you're in middle school.

]]>If you are using angles greater than 90 degrees, then you are not in the first quadrant anymore. Using the unit circle definition, the cosine of the angle is the x-coordinate when it is on the unit circle and the sine of the angle is the y-coordinate. So it is possible to have negative sines and cosines. The tangent is simply the slope of the line.

I hope this explanation helps

]]>Another way is to roughen the edges; thinking the sine/cosine wave as a bunch of little lines connected to each other.

Also if you enter larger angles you'll have to resort to the unit circle definition.

]]>(I have no idea what I'm talking about here, this is just a guess.)

]]>Like if you put in 50, it'll take the sine/cosine/tangent of the angle that's 50 in a triangle with angles 50, 90 and 40.

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