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Trigonometry 9 Online
OpenStudy (anonymous):

What's the sin, cos and tan of -pi/2 or -90 degrees? I know that the sin is equal to one because you take root two as the hypotenuse and opposite (at least I hope that's how it's done) but for cos which one do you consider adjacent if your angle is -90 degrees. Could someone show me how to draw the triangle on a Cartesian grid?

OpenStudy (radar):

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