Trigonometry Examples

Solve for x cos(x)^2=0.24
Step 1
Take the specified root of both sides of the equation to eliminate the exponent on the left side.
Step 2
The complete solution is the result of both the positive and negative portions of the solution.
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Step 2.1
First, use the positive value of the to find the first solution.
Step 2.2
Next, use the negative value of the to find the second solution.
Step 2.3
The complete solution is the result of both the positive and negative portions of the solution.
Step 3
Set up each of the solutions to solve for .
Step 4
Solve for in .
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Step 4.1
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 4.2
Simplify the right side.
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Step 4.2.1
Evaluate .
Step 4.3
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 4.4
Solve for .
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Step 4.4.1
Remove parentheses.
Step 4.4.2
Simplify .
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Step 4.4.2.1
Multiply by .
Step 4.4.2.2
Subtract from .
Step 4.5
Find the period of .
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Step 4.5.1
The period of the function can be calculated using .
Step 4.5.2
Replace with in the formula for period.
Step 4.5.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 4.5.4
Divide by .
Step 4.6
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
Step 5
Solve for in .
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Step 5.1
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 5.2
Simplify the right side.
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Step 5.2.1
Evaluate .
Step 5.3
The cosine function is negative in the second and third quadrants. To find the second solution, subtract the reference angle from to find the solution in the third quadrant.
Step 5.4
Solve for .
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Step 5.4.1
Remove parentheses.
Step 5.4.2
Simplify .
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Step 5.4.2.1
Multiply by .
Step 5.4.2.2
Subtract from .
Step 5.5
Find the period of .
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Step 5.5.1
The period of the function can be calculated using .
Step 5.5.2
Replace with in the formula for period.
Step 5.5.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 5.5.4
Divide by .
Step 5.6
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
Step 6
List all of the solutions.
, for any integer
Step 7
Consolidate the solutions.
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Step 7.1
Consolidate and to .
, for any integer
Step 7.2
Consolidate and to .
, for any integer
, for any integer