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Trigonometry Examples
Step 1
Step 1.1
Rewrite in terms of sines and cosines.
Step 2
Step 2.1
Rewrite in terms of sines and cosines.
Step 3
Multiply both sides of the equation by .
Step 4
Apply the distributive property.
Step 5
Rewrite using the commutative property of multiplication.
Step 6
Step 6.1
Cancel the common factor.
Step 6.2
Rewrite the expression.
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
Step 8.1
Cancel the common factor.
Step 8.2
Rewrite the expression.
Step 9
Subtract from both sides of the equation.
Step 10
Step 10.1
Move .
Step 10.2
Apply the cosine double-angle identity.
Step 11
Use the double-angle identity to transform to .
Step 12
Step 12.1
Reorder terms.
Step 12.2
For a polynomial of the form , rewrite the middle term as a sum of two terms whose product is and whose sum is .
Step 12.2.1
Multiply by .
Step 12.2.2
Rewrite as plus
Step 12.2.3
Apply the distributive property.
Step 12.3
Factor out the greatest common factor from each group.
Step 12.3.1
Group the first two terms and the last two terms.
Step 12.3.2
Factor out the greatest common factor (GCF) from each group.
Step 12.4
Factor the polynomial by factoring out the greatest common factor, .
Step 13
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Step 14
Step 14.1
Set equal to .
Step 14.2
Solve for .
Step 14.2.1
Add to both sides of the equation.
Step 14.2.2
Divide each term in by and simplify.
Step 14.2.2.1
Divide each term in by .
Step 14.2.2.2
Simplify the left side.
Step 14.2.2.2.1
Cancel the common factor of .
Step 14.2.2.2.1.1
Cancel the common factor.
Step 14.2.2.2.1.2
Divide by .
Step 14.2.2.3
Simplify the right side.
Step 14.2.2.3.1
Move the negative in front of the fraction.
Step 14.2.3
Take the inverse sine of both sides of the equation to extract from inside the sine.
Step 14.2.4
Simplify the right side.
Step 14.2.4.1
The exact value of is .
Step 14.2.5
The sine 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 14.2.6
Simplify the expression to find the second solution.
Step 14.2.6.1
Subtract from .
Step 14.2.6.2
The resulting angle of is positive, less than , and coterminal with .
Step 14.2.7
Find the period of .
Step 14.2.7.1
The period of the function can be calculated using .
Step 14.2.7.2
Replace with in the formula for period.
Step 14.2.7.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 14.2.7.4
Divide by .
Step 14.2.8
Add to every negative angle to get positive angles.
Step 14.2.8.1
Add to to find the positive angle.
Step 14.2.8.2
To write as a fraction with a common denominator, multiply by .
Step 14.2.8.3
Combine fractions.
Step 14.2.8.3.1
Combine and .
Step 14.2.8.3.2
Combine the numerators over the common denominator.
Step 14.2.8.4
Simplify the numerator.
Step 14.2.8.4.1
Multiply by .
Step 14.2.8.4.2
Subtract from .
Step 14.2.8.5
List the new angles.
Step 14.2.9
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 15
Step 15.1
Set equal to .
Step 15.2
Solve for .
Step 15.2.1
Add to both sides of the equation.
Step 15.2.2
Take the inverse sine of both sides of the equation to extract from inside the sine.
Step 15.2.3
Simplify the right side.
Step 15.2.3.1
The exact value of is .
Step 15.2.4
The sine function is positive in the first and second quadrants. To find the second solution, subtract the reference angle from to find the solution in the second quadrant.
Step 15.2.5
Simplify .
Step 15.2.5.1
To write as a fraction with a common denominator, multiply by .
Step 15.2.5.2
Combine fractions.
Step 15.2.5.2.1
Combine and .
Step 15.2.5.2.2
Combine the numerators over the common denominator.
Step 15.2.5.3
Simplify the numerator.
Step 15.2.5.3.1
Move to the left of .
Step 15.2.5.3.2
Subtract from .
Step 15.2.6
Find the period of .
Step 15.2.6.1
The period of the function can be calculated using .
Step 15.2.6.2
Replace with in the formula for period.
Step 15.2.6.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 15.2.6.4
Divide by .
Step 15.2.7
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 16
The final solution is all the values that make true.
, for any integer
Step 17
Consolidate the answers.
, for any integer