Trigonometry Examples

Solve for x 6sin(x)^2+12sin(x)+6=0
Step 1
Substitute for .
Step 2
Factor the left side of the equation.
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Step 2.1
Factor out of .
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Step 2.1.1
Factor out of .
Step 2.1.2
Factor out of .
Step 2.1.3
Factor out of .
Step 2.1.4
Factor out of .
Step 2.1.5
Factor out of .
Step 2.2
Factor using the perfect square rule.
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Step 2.2.1
Rewrite as .
Step 2.2.2
Check that the middle term is two times the product of the numbers being squared in the first term and third term.
Step 2.2.3
Rewrite the polynomial.
Step 2.2.4
Factor using the perfect square trinomial rule , where and .
Step 3
Divide each term in by and simplify.
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Step 3.1
Divide each term in by .
Step 3.2
Simplify the left side.
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Step 3.2.1
Cancel the common factor of .
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Step 3.2.1.1
Cancel the common factor.
Step 3.2.1.2
Divide by .
Step 3.3
Simplify the right side.
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Step 3.3.1
Divide by .
Step 4
Set the equal to .
Step 5
Subtract from both sides of the equation.
Step 6
Substitute for .
Step 7
Take the inverse sine of both sides of the equation to extract from inside the sine.
Step 8
Simplify the right side.
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Step 8.1
The exact value of is .
Step 9
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 10
Simplify the expression to find the second solution.
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Step 10.1
Subtract from .
Step 10.2
The resulting angle of is positive, less than , and coterminal with .
Step 11
Find the period of .
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Step 11.1
The period of the function can be calculated using .
Step 11.2
Replace with in the formula for period.
Step 11.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 11.4
Divide by .
Step 12
Add to every negative angle to get positive angles.
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Step 12.1
Add to to find the positive angle.
Step 12.2
To write as a fraction with a common denominator, multiply by .
Step 12.3
Combine fractions.
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Step 12.3.1
Combine and .
Step 12.3.2
Combine the numerators over the common denominator.
Step 12.4
Simplify the numerator.
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Step 12.4.1
Multiply by .
Step 12.4.2
Subtract from .
Step 12.5
List the new angles.
Step 13
The period of the function is so values will repeat every radians in both directions.
, for any integer
Step 14
Consolidate the answers.
, for any integer