4 thoughts on “2.12”

    1. Because your calculator is a liar. Note that the angle we are describing terminates in quadrant 2 not quadrant 4. The arctan function can only return values between -90^\circ and 90^\circ, so we must always interpret the results from the arctan function to ensure that they are sane with regard to the terminal quadrant that the angle we are describing.

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Tutoring for Statics, Dynamics, and Controls courses at Texas A&M