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The Complete Idiot's Guide to Trigonometry by Izolda Fotiyeva, Dmitriy Fotiyev

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Other Inverse Trigonometric Functions

This section summarizes other inverse trigonometric functions. Here, we discuss in more detail the other two most common inverse trigonometric functions—the inverse cosine and the inverse tangent. The inverses for the reciprocal functions are briefly mentioned as well.

Inverse Cosine and Tangent Functions

The cosine function is uniquely defined (in the sense that it does not repeat itself) on the interval 183-1.png. Consequently, on this interval the cosine has an inverse function denoted as y = arccosx or y = cos–1x. Because the cosine can be equal to values only from –1 to +1, the domain of the inverse cosine (i.e., ...

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