Trigonometry Examples

Solve for x in Degrees 2sin(4x)+6=5
Step 1
Move all terms not containing to the right side of the equation.
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Step 1.1
Subtract from both sides of the equation.
Step 1.2
Subtract from .
Step 2
Divide each term in by and simplify.
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Step 2.1
Divide each term in by .
Step 2.2
Simplify the left side.
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Step 2.2.1
Cancel the common factor of .
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Step 2.2.1.1
Cancel the common factor.
Step 2.2.1.2
Divide by .
Step 2.3
Simplify the right side.
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Step 2.3.1
Move the negative in front of the fraction.
Step 3
Take the inverse sine of both sides of the equation to extract from inside the sine.
Step 4
Simplify the right side.
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Step 4.1
The exact value of is .
Step 5
Divide each term in by and simplify.
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Step 5.1
Divide each term in by .
Step 5.2
Simplify the left side.
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Step 5.2.1
Cancel the common factor of .
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Step 5.2.1.1
Cancel the common factor.
Step 5.2.1.2
Divide by .
Step 5.3
Simplify the right side.
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Step 5.3.1
Cancel the common factor of and .
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Step 5.3.1.1
Factor out of .
Step 5.3.1.2
Cancel the common factors.
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Step 5.3.1.2.1
Factor out of .
Step 5.3.1.2.2
Cancel the common factor.
Step 5.3.1.2.3
Rewrite the expression.
Step 5.3.2
Move the negative in front of the fraction.
Step 6
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 7
Simplify the expression to find the second solution.
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Step 7.1
Subtract from .
Step 7.2
The resulting angle of is positive, less than , and coterminal with .
Step 7.3
Divide each term in by and simplify.
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Step 7.3.1
Divide each term in by .
Step 7.3.2
Simplify the left side.
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Step 7.3.2.1
Cancel the common factor of .
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Step 7.3.2.1.1
Cancel the common factor.
Step 7.3.2.1.2
Divide by .
Step 7.3.3
Simplify the right side.
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Step 7.3.3.1
Cancel the common factor of and .
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Step 7.3.3.1.1
Factor out of .
Step 7.3.3.1.2
Cancel the common factors.
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Step 7.3.3.1.2.1
Factor out of .
Step 7.3.3.1.2.2
Cancel the common factor.
Step 7.3.3.1.2.3
Rewrite the expression.
Step 8
Find the period of .
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Step 8.1
The period of the function can be calculated using .
Step 8.2
Replace with in the formula for period.
Step 8.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 8.4
Divide by .
Step 9
Add to every negative angle to get positive angles.
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Step 9.1
Add to to find the positive angle.
Step 9.2
To write as a fraction with a common denominator, multiply by .
Step 9.3
Combine and .
Step 9.4
Combine the numerators over the common denominator.
Step 9.5
Simplify the numerator.
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Step 9.5.1
Multiply by .
Step 9.5.2
Subtract from .
Step 9.6
List the new angles.
Step 10
The period of the function is so values will repeat every degrees in both directions.
, for any integer