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Trigonometry Examples
Step 1
Rewrite the equation as .
Step 2
The exact value of is .
Step 3
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 4
Step 4.1
The exact value of is .
Step 5
The cosine function is positive in the first and fourth quadrants. To find the second solution, subtract the reference angle from to find the solution in the fourth quadrant.
Step 6
Subtract from .
Step 7
Step 7.1
The period of the function can be calculated using .
Step 7.2
Replace with in the formula for period.
Step 7.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 7.4
Divide by .
Step 8
The period of the function is so values will repeat every degrees in both directions.
, for any integer