Trigonometry Examples

Solve for x cos(3x)=4cos(x)^3-3cos(x)
Step 1
Apply the cosine triple-angle identity.
Step 2
For the two functions to be equal, the arguments of each must be equal.
Step 3
Move all terms containing to the left side of the equation.
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Step 3.1
Subtract from both sides of the equation.
Step 3.2
Subtract from .
Step 4
Since , the equation will always be true for any value of .
All real numbers
Step 5
The result can be shown in multiple forms.
All real numbers
Interval Notation: