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Trigonometry Examples
Step 1
Replace the with based on the identity.
Step 2
Reorder the polynomial.
Step 3
Substitute for .
Step 4
Add to both sides of the equation.
Step 5
Add and .
Step 6
Step 6.1
Consider the form . Find a pair of integers whose product is and whose sum is . In this case, whose product is and whose sum is .
Step 6.2
Write the factored form using these integers.
Step 7
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Step 8
Step 8.1
Set equal to .
Step 8.2
Subtract from both sides of the equation.
Step 9
Step 9.1
Set equal to .
Step 9.2
Subtract from both sides of the equation.
Step 10
The final solution is all the values that make true.
Step 11
Substitute for .
Step 12
Set up each of the solutions to solve for .
Step 13
Step 13.1
Take the inverse cosecant of both sides of the equation to extract from inside the cosecant.
Step 13.2
Simplify the right side.
Step 13.2.1
The exact value of is .
Step 13.3
The cosecant function is negative in the third and fourth quadrants. To find the second solution, subtract the solution from , to find a reference angle. Next, add this reference angle to to find the solution in the third quadrant.
Step 13.4
Simplify the expression to find the second solution.
Step 13.4.1
Subtract from .
Step 13.4.2
The resulting angle of is positive, less than , and coterminal with .
Step 13.5
Find the period of .
Step 13.5.1
The period of the function can be calculated using .
Step 13.5.2
Replace with in the formula for period.
Step 13.5.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 13.5.4
Divide by .
Step 13.6
Add to every negative angle to get positive angles.
Step 13.6.1
Add to to find the positive angle.
Step 13.6.2
To write as a fraction with a common denominator, multiply by .
Step 13.6.3
Combine fractions.
Step 13.6.3.1
Combine and .
Step 13.6.3.2
Combine the numerators over the common denominator.
Step 13.6.4
Simplify the numerator.
Step 13.6.4.1
Multiply by .
Step 13.6.4.2
Subtract from .
Step 13.6.5
List the new angles.
Step 13.7
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
Step 14
Step 14.1
Take the inverse cosecant of both sides of the equation to extract from inside the cosecant.
Step 14.2
Simplify the right side.
Step 14.2.1
The exact value of is .
Step 14.3
The cosecant function is negative in the third and fourth quadrants. To find the second solution, subtract the solution from , to find a reference angle. Next, add this reference angle to to find the solution in the third quadrant.
Step 14.4
Simplify the expression to find the second solution.
Step 14.4.1
Subtract from .
Step 14.4.2
The resulting angle of is positive, less than , and coterminal with .
Step 14.5
Find the period of .
Step 14.5.1
The period of the function can be calculated using .
Step 14.5.2
Replace with in the formula for period.
Step 14.5.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 14.5.4
Divide by .
Step 14.6
Add to every negative angle to get positive angles.
Step 14.6.1
Add to to find the positive angle.
Step 14.6.2
To write as a fraction with a common denominator, multiply by .
Step 14.6.3
Combine fractions.
Step 14.6.3.1
Combine and .
Step 14.6.3.2
Combine the numerators over the common denominator.
Step 14.6.4
Simplify the numerator.
Step 14.6.4.1
Multiply by .
Step 14.6.4.2
Subtract from .
Step 14.6.5
List the new angles.
Step 14.7
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
Step 15
List all of the solutions.
, for any integer
Step 16
Consolidate and to .
, for any integer