The inverse of cos x is a function. THe domain of cos x could be
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Tutor.com
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A discussion of trig functions of complex numbers.
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Ask Dr. Math
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A discussion with visualizations.
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Ask Dr. Math
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An overview of how to compute trigonometric functions
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Clark University
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Explains what a tangent is and why it matters. Explains the relationship between a tangent in Geometry and a tangent in Trigonometry.
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Dave's Short Trig Course
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Explains what a cosine is and why it matters.
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Dave's Short Trig Course
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Explains what a sine is and why it matters.
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Dave's Short Trig Course
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This website will allow students to practice identifying which trig function to use and when.
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AAA Math
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This website will define the trig functions of sine, cosine and tangent. You will be able to practice using them by setting up their ratios.
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AAA Math
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