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Trigonometry Examples
Step 1
Step 1.1
Rewrite in terms of sines and cosines.
Step 2
Step 2.1
Simplify .
Step 2.1.1
Rewrite in terms of sines and cosines.
Step 2.1.2
Multiply .
Step 2.1.2.1
Combine and .
Step 2.1.2.2
Raise to the power of .
Step 2.1.2.3
Raise to the power of .
Step 2.1.2.4
Use the power rule to combine exponents.
Step 2.1.2.5
Add and .
Step 3
Multiply both sides of the equation by .
Step 4
Apply the distributive property.
Step 5
Step 5.1
Cancel the common factor.
Step 5.2
Rewrite the expression.
Step 6
Rewrite using the commutative property of multiplication.
Step 7
Step 7.1
Raise to the power of .
Step 7.2
Raise to the power of .
Step 7.3
Use the power rule to combine exponents.
Step 7.4
Add and .
Step 8
Apply pythagorean identity.
Step 9
Step 9.1
Cancel the common factor.
Step 9.2
Rewrite the expression.
Step 10
Since the exponents are equal, the bases of the exponents on both sides of the equation must be equal.
Step 11
Step 11.1
Rewrite the absolute value equation as four equations without absolute value bars.
Step 11.2
After simplifying, there are only two unique equations to be solved.
Step 11.3
Solve for .
Step 11.3.1
For the two functions to be equal, the arguments of each must be equal.
Step 11.3.2
Move all terms containing to the left side of the equation.
Step 11.3.2.1
Subtract from both sides of the equation.
Step 11.3.2.2
Subtract from .
Step 11.3.3
Since , the equation will always be true.
All real numbers
All real numbers
Step 11.4
Solve for .
Step 11.4.1
Move all terms containing to the left side of the equation.
Step 11.4.1.1
Add to both sides of the equation.
Step 11.4.1.2
Add and .
Step 11.4.2
Divide each term in by and simplify.
Step 11.4.2.1
Divide each term in by .
Step 11.4.2.2
Simplify the left side.
Step 11.4.2.2.1
Cancel the common factor of .
Step 11.4.2.2.1.1
Cancel the common factor.
Step 11.4.2.2.1.2
Divide by .
Step 11.4.2.3
Simplify the right side.
Step 11.4.2.3.1
Divide by .
Step 11.4.3
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 11.4.4
Simplify the right side.
Step 11.4.4.1
The exact value of is .
Step 11.4.5
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 11.4.6
Simplify .
Step 11.4.6.1
To write as a fraction with a common denominator, multiply by .
Step 11.4.6.2
Combine fractions.
Step 11.4.6.2.1
Combine and .
Step 11.4.6.2.2
Combine the numerators over the common denominator.
Step 11.4.6.3
Simplify the numerator.
Step 11.4.6.3.1
Multiply by .
Step 11.4.6.3.2
Subtract from .
Step 11.4.7
Find the period of .
Step 11.4.7.1
The period of the function can be calculated using .
Step 11.4.7.2
Replace with in the formula for period.
Step 11.4.7.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 11.4.7.4
Divide by .
Step 11.4.8
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
, for any integer
Step 12
Consolidate the answers.
, for any integer