Trigonometry Examples

Solve for x cos(x)=pi/3
Step 1
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 2
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 3
Find the period of .
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Step 3.1
The period of the function can be calculated using .
Step 3.2
Replace with in the formula for period.
Step 3.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 3.4
Divide by .
Step 4
The period of the function is so values will repeat every radians in both directions.
, for any integer