Trigonometry Examples

Solve for ? tan(x)=-1
tan(x)=-1
Step 1
Take the inverse tangent of both sides of the equation to extract x from inside the tangent.
x=arctan(-1)
Step 2
Simplify the right side.
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Step 2.1
The exact value of arctan(-1) is -π4.
x=-π4
x=-π4
Step 3
The tangent function is negative in the second and fourth quadrants. To find the second solution, subtract the reference angle from π to find the solution in the third quadrant.
x=-π4-π
Step 4
Simplify the expression to find the second solution.
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Step 4.1
Add 2π to -π4-π.
x=-π4-π+2π
Step 4.2
The resulting angle of 3π4 is positive and coterminal with -π4-π.
x=3π4
x=3π4
Step 5
Find the period of tan(x).
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Step 5.1
The period of the function can be calculated using π|b|.
π|b|
Step 5.2
Replace b with 1 in the formula for period.
π|1|
Step 5.3
The absolute value is the distance between a number and zero. The distance between 0 and 1 is 1.
π1
Step 5.4
Divide π by 1.
π
π
Step 6
Add π to every negative angle to get positive angles.
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Step 6.1
Add π to -π4 to find the positive angle.
-π4+π
Step 6.2
To write π as a fraction with a common denominator, multiply by 44.
π44-π4
Step 6.3
Combine fractions.
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Step 6.3.1
Combine π and 44.
π44-π4
Step 6.3.2
Combine the numerators over the common denominator.
π4-π4
π4-π4
Step 6.4
Simplify the numerator.
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Step 6.4.1
Move 4 to the left of π.
4π-π4
Step 6.4.2
Subtract π from 4π.
3π4
3π4
Step 6.5
List the new angles.
x=3π4
x=3π4
Step 7
The period of the tan(x) function is π so values will repeat every π radians in both directions.
x=3π4+πn,3π4+πn, for any integer n
Step 8
Consolidate the answers.
x=3π4+πn, for any integer n
Enter a problem...
 [x2  12  π  xdx ]