Graphing Sine and Cosine — Quiz

Question 16 • Mathematics III

What is the domain of f of x is equal to cosine of x ?

Answer

the set of real numbers 0 is less than or equal to x comma x is less than or equal to 2 pi

the set of real numbers negative 1 is less than or equal to x comma x is less than or equal to 1

the set of all real numbers

the set of real numbers negative 2 pi is less than or equal to x comma x is less than or equal to 2 pi

Cosine is defined for every real-number input, so there is no restriction on x. The domain is the set of all real numbers, which is choice B.

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