Calculus Examples

Convert to Interval Notation tan(x)>=1
Step 1
Take the inverse tangent of both sides of the equation to extract from inside the tangent.
Step 2
Simplify the right side.
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Step 2.1
The exact value of is .
Step 3
The tangent function is positive in the first and third quadrants. To find the second solution, add the reference angle from to find the solution in the fourth quadrant.
Step 4
Simplify .
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Step 4.1
To write as a fraction with a common denominator, multiply by .
Step 4.2
Combine fractions.
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Step 4.2.1
Combine and .
Step 4.2.2
Combine the numerators over the common denominator.
Step 4.3
Simplify the numerator.
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Step 4.3.1
Move to the left of .
Step 4.3.2
Add and .
Step 5
Find the period of .
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Step 5.1
The period of the function can be calculated using .
Step 5.2
Replace with in the formula for period.
Step 5.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 5.4
Divide by .
Step 6
The period of the function is so values will repeat every radians in both directions.
, for any integer
Step 7
Consolidate the answers.
, for any integer
Step 8
Find the domain of .
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Step 8.1
Set the argument in equal to to find where the expression is undefined.
, for any integer
Step 8.2
The domain is all values of that make the expression defined.
, for any integer
, for any integer
Step 9
Use each root to create test intervals.
Step 10
Choose a test value from each interval and plug this value into the original inequality to determine which intervals satisfy the inequality.
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Step 10.1
Test a value on the interval to see if it makes the inequality true.
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Step 10.1.1
Choose a value on the interval and see if this value makes the original inequality true.
Step 10.1.2
Replace with in the original inequality.
Step 10.1.3
The left side is greater than the right side , which means that the given statement is always true.
True
True
Step 10.2
Test a value on the interval to see if it makes the inequality true.
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Step 10.2.1
Choose a value on the interval and see if this value makes the original inequality true.
Step 10.2.2
Replace with in the original inequality.
Step 10.2.3
The left side is less than the right side , which means that the given statement is false.
False
False
Step 10.3
Compare the intervals to determine which ones satisfy the original inequality.
True
False
True
False
Step 11
The solution consists of all of the true intervals.
, for any integer
Step 12
Convert the inequality to interval notation.
Step 13