Trigonometry Examples

Graph h(x)=8-cot(x/3-pi/2)
Step 1
Find the asymptotes.
Tap for more steps...
Step 1.1
For any , vertical asymptotes occur at , where is an integer. Use the basic period for , , to find the vertical asymptotes for . Set the inside of the cotangent function, , for equal to to find where the vertical asymptote occurs for .
Step 1.2
Solve for .
Tap for more steps...
Step 1.2.1
Add to both sides of the equation.
Step 1.2.2
Multiply both sides of the equation by .
Step 1.2.3
Simplify both sides of the equation.
Tap for more steps...
Step 1.2.3.1
Simplify the left side.
Tap for more steps...
Step 1.2.3.1.1
Cancel the common factor of .
Tap for more steps...
Step 1.2.3.1.1.1
Cancel the common factor.
Step 1.2.3.1.1.2
Rewrite the expression.
Step 1.2.3.2
Simplify the right side.
Tap for more steps...
Step 1.2.3.2.1
Combine and .
Step 1.3
Set the inside of the cotangent function equal to .
Step 1.4
Solve for .
Tap for more steps...
Step 1.4.1
Move all terms not containing to the right side of the equation.
Tap for more steps...
Step 1.4.1.1
Add to both sides of the equation.
Step 1.4.1.2
To write as a fraction with a common denominator, multiply by .
Step 1.4.1.3
Combine and .
Step 1.4.1.4
Combine the numerators over the common denominator.
Step 1.4.1.5
Simplify the numerator.
Tap for more steps...
Step 1.4.1.5.1
Move to the left of .
Step 1.4.1.5.2
Add and .
Step 1.4.2
Multiply both sides of the equation by .
Step 1.4.3
Simplify both sides of the equation.
Tap for more steps...
Step 1.4.3.1
Simplify the left side.
Tap for more steps...
Step 1.4.3.1.1
Cancel the common factor of .
Tap for more steps...
Step 1.4.3.1.1.1
Cancel the common factor.
Step 1.4.3.1.1.2
Rewrite the expression.
Step 1.4.3.2
Simplify the right side.
Tap for more steps...
Step 1.4.3.2.1
Multiply .
Tap for more steps...
Step 1.4.3.2.1.1
Combine and .
Step 1.4.3.2.1.2
Multiply by .
Step 1.5
The basic period for will occur at , where and are vertical asymptotes.
Step 1.6
Find the period to find where the vertical asymptotes exist.
Tap for more steps...
Step 1.6.1
is approximately which is positive so remove the absolute value
Step 1.6.2
Multiply the numerator by the reciprocal of the denominator.
Step 1.6.3
Move to the left of .
Step 1.7
The vertical asymptotes for occur at , , and every , where is an integer.
Step 1.8
Cotangent only has vertical asymptotes.
No Horizontal Asymptotes
No Oblique Asymptotes
Vertical Asymptotes: where is an integer
No Horizontal Asymptotes
No Oblique Asymptotes
Vertical Asymptotes: where is an integer
Step 2
Rewrite the expression as .
Step 3
Use the form to find the variables used to find the amplitude, period, phase shift, and vertical shift.
Step 4
Since the graph of the function does not have a maximum or minimum value, there can be no value for the amplitude.
Amplitude: None
Step 5
Find the period using the formula .
Tap for more steps...
Step 5.1
Find the period of .
Tap for more steps...
Step 5.1.1
The period of the function can be calculated using .
Step 5.1.2
Replace with in the formula for period.
Step 5.1.3
is approximately which is positive so remove the absolute value
Step 5.1.4
Multiply the numerator by the reciprocal of the denominator.
Step 5.1.5
Move to the left of .
Step 5.2
Find the period of .
Tap for more steps...
Step 5.2.1
The period of the function can be calculated using .
Step 5.2.2
Replace with in the formula for period.
Step 5.2.3
is approximately which is positive so remove the absolute value
Step 5.2.4
Multiply the numerator by the reciprocal of the denominator.
Step 5.2.5
Move to the left of .
Step 5.3
The period of addition/subtraction of trig functions is the maximum of the individual periods.
Step 6
Find the phase shift using the formula .
Tap for more steps...
Step 6.1
The phase shift of the function can be calculated from .
Phase Shift:
Step 6.2
Replace the values of and in the equation for phase shift.
Phase Shift:
Step 6.3
Multiply the numerator by the reciprocal of the denominator.
Phase Shift:
Step 6.4
Combine and .
Phase Shift:
Step 6.5
Move to the left of .
Phase Shift:
Phase Shift:
Step 7
List the properties of the trigonometric function.
Amplitude: None
Period:
Phase Shift: ( to the right)
Vertical Shift:
Step 8
The trig function can be graphed using the amplitude, period, phase shift, vertical shift, and the points.
Vertical Asymptotes: where is an integer
Amplitude: None
Period:
Phase Shift: ( to the right)
Vertical Shift:
Step 9