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Trigonometry Examples
Step 1
Subtract from both sides of the equation.
Step 2
Replace the with based on the identity.
Step 3
Subtract from .
Step 4
Reorder the polynomial.
Step 5
Step 5.1
Subtract from both sides of the equation.
Step 5.2
Add to both sides of the equation.
Step 6
Step 6.1
Divide each term in by .
Step 6.2
Simplify the left side.
Step 6.2.1
Cancel the common factor of .
Step 6.2.1.1
Cancel the common factor.
Step 6.2.1.2
Divide by .
Step 6.3
Simplify the right side.
Step 6.3.1
Simplify each term.
Step 6.3.1.1
Dividing two negative values results in a positive value.
Step 6.3.1.2
Multiply the numerator by the reciprocal of the denominator.
Step 6.3.1.3
Move the negative in front of the fraction.
Step 6.3.1.4
Multiply .
Step 6.3.1.4.1
Multiply by .
Step 6.3.1.4.2
Multiply by .
Step 7
Take the specified root of both sides of the equation to eliminate the exponent on the left side.
Step 8
Step 8.1
To write as a fraction with a common denominator, multiply by .
Step 8.2
Write each expression with a common denominator of , by multiplying each by an appropriate factor of .
Step 8.2.1
Multiply by .
Step 8.2.2
Multiply by .
Step 8.3
Combine the numerators over the common denominator.
Step 8.4
Rewrite as .
Step 8.5
Simplify the denominator.
Step 8.5.1
Rewrite as .
Step 8.5.2
Pull terms out from under the radical, assuming positive real numbers.
Step 9
Step 9.1
First, use the positive value of the to find the first solution.
Step 9.2
Next, use the negative value of the to find the second solution.
Step 9.3
The complete solution is the result of both the positive and negative portions of the solution.
Step 10
Set up each of the solutions to solve for .
Step 11
Step 11.1
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 11.2
Simplify the right side.
Step 11.2.1
Evaluate .
Step 11.3
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 11.4
Simplify .
Step 11.4.1
To write as a fraction with a common denominator, multiply by .
Step 11.4.2
Combine fractions.
Step 11.4.2.1
Combine and .
Step 11.4.2.2
Combine the numerators over the common denominator.
Step 11.4.3
Simplify the numerator.
Step 11.4.3.1
Multiply by .
Step 11.4.3.2
Subtract from .
Step 11.5
Find the period of .
Step 11.5.1
The period of the function can be calculated using .
Step 11.5.2
Replace with in the formula for period.
Step 11.5.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 11.5.4
Divide by .
Step 11.6
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
Step 12
Step 12.1
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 12.2
Simplify the right side.
Step 12.2.1
Evaluate .
Step 12.3
The cosine function is negative in the second and third quadrants. To find the second solution, subtract the reference angle from to find the solution in the third quadrant.
Step 12.4
Simplify .
Step 12.4.1
To write as a fraction with a common denominator, multiply by .
Step 12.4.2
Combine fractions.
Step 12.4.2.1
Combine and .
Step 12.4.2.2
Combine the numerators over the common denominator.
Step 12.4.3
Simplify the numerator.
Step 12.4.3.1
Multiply by .
Step 12.4.3.2
Subtract from .
Step 12.5
Find the period of .
Step 12.5.1
The period of the function can be calculated using .
Step 12.5.2
Replace with in the formula for period.
Step 12.5.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 12.5.4
Divide by .
Step 12.6
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
Step 13
List all of the solutions.
, for any integer
Step 14
Step 14.1
Consolidate and to .
, for any integer
Step 14.2
Consolidate and to .
, for any integer
, for any integer