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Trigonometry Examples
Step 1
Subtract from both sides of the equation.
Step 2
Step 2.1
Use the double-angle identity to transform to .
Step 2.2
Subtract from .
Step 3
Step 3.1
Reorder terms.
Step 3.2
For a polynomial of the form , rewrite the middle term as a sum of two terms whose product is and whose sum is .
Step 3.2.1
Factor out of .
Step 3.2.2
Rewrite as plus
Step 3.2.3
Apply the distributive property.
Step 3.2.4
Multiply by .
Step 3.3
Factor out the greatest common factor from each group.
Step 3.3.1
Group the first two terms and the last two terms.
Step 3.3.2
Factor out the greatest common factor (GCF) from each group.
Step 3.4
Factor the polynomial by factoring out the greatest common factor, .
Step 4
If any individual factor on the left side of the equation is equal to , the entire expression will be equal to .
Step 5
Step 5.1
Set equal to .
Step 5.2
Solve for .
Step 5.2.1
Subtract from both sides of the equation.
Step 5.2.2
Divide each term in by and simplify.
Step 5.2.2.1
Divide each term in by .
Step 5.2.2.2
Simplify the left side.
Step 5.2.2.2.1
Cancel the common factor of .
Step 5.2.2.2.1.1
Cancel the common factor.
Step 5.2.2.2.1.2
Divide by .
Step 5.2.2.3
Simplify the right side.
Step 5.2.2.3.1
Dividing two negative values results in a positive value.
Step 5.2.3
Take the inverse sine of both sides of the equation to extract from inside the sine.
Step 5.2.4
Simplify the right side.
Step 5.2.4.1
The exact value of is .
Step 5.2.5
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 5.2.6
Simplify .
Step 5.2.6.1
To write as a fraction with a common denominator, multiply by .
Step 5.2.6.2
Combine fractions.
Step 5.2.6.2.1
Combine and .
Step 5.2.6.2.2
Combine the numerators over the common denominator.
Step 5.2.6.3
Simplify the numerator.
Step 5.2.6.3.1
Move to the left of .
Step 5.2.6.3.2
Subtract from .
Step 5.2.7
Find the period of .
Step 5.2.7.1
The period of the function can be calculated using .
Step 5.2.7.2
Replace with in the formula for period.
Step 5.2.7.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 5.2.7.4
Divide by .
Step 5.2.8
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 6
Step 6.1
Set equal to .
Step 6.2
Solve for .
Step 6.2.1
Add to both sides of the equation.
Step 6.2.2
Take the inverse sine of both sides of the equation to extract from inside the sine.
Step 6.2.3
Simplify the right side.
Step 6.2.3.1
The exact value of is .
Step 6.2.4
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 6.2.5
Simplify .
Step 6.2.5.1
To write as a fraction with a common denominator, multiply by .
Step 6.2.5.2
Combine fractions.
Step 6.2.5.2.1
Combine and .
Step 6.2.5.2.2
Combine the numerators over the common denominator.
Step 6.2.5.3
Simplify the numerator.
Step 6.2.5.3.1
Move to the left of .
Step 6.2.5.3.2
Subtract from .
Step 6.2.6
Find the period of .
Step 6.2.6.1
The period of the function can be calculated using .
Step 6.2.6.2
Replace with in the formula for period.
Step 6.2.6.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 6.2.6.4
Divide by .
Step 6.2.7
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 7
The final solution is all the values that make true.
, for any integer