Find the Range y=cos(2x)-1

Find the Range y=cos(2x)-1
Find the magnitude of the trig term by taking the absolute value of the coefficient.
Find the lower bound of the range.
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The lower bound of the range for cosine is found by substituting the negative magnitude of the coefficient into the equation.
Subtract from .
Find the upper bound of the range.
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The upper bound of the range for cosine is found by substituting the positive magnitude of the coefficient into the equation.
Subtract from .
The range is .
Interval Notation:
Set-Builder Notation:
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