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- Cotangent(x) = 1/tangent(x) To enter cotangent of 45, for example type 1/tan(45). But you can purchase (or borrow) a TI84 calculator and use the TI83's transfer cable to transfer data from the 83...
- Object: Math We can also calculate trigonometrical values using the predefined math object methods or function. We can calculate sin, cos, tan, arc cosine, arc sine, arc tan values.

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- for the cotangent and the cosecant, where k is an arbitrary integer. Recurrences relations may also be computed for the coefficients of the Taylor series of the other trigonometric functions.
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