Answer:
Example Problem
Solve 2x+3=15.
Example Answer
x=6
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First type the equation 2x+3=15.
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Step-by-step explanation:
ANSWER
d. The set of all real numbers
EXPLANATION
The basic cosine function ,

is continuous everywhere.
The function is defined for all real values of x.
The domain is the set all values of x that will make the function defined.
The domain is all real numbers.
The correct choice is D.
Square root of (5-9)^2+(1+6)^2