Finite Math Examples

Find the Roots (Zeros) f(x)=5cos(pix)^2
Step 1
Set equal to .
Step 2
Solve for .
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Step 2.1
Divide each term in by and simplify.
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Step 2.1.1
Divide each term in by .
Step 2.1.2
Simplify the left side.
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Step 2.1.2.1
Cancel the common factor of .
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Step 2.1.2.1.1
Cancel the common factor.
Step 2.1.2.1.2
Divide by .
Step 2.1.3
Simplify the right side.
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Step 2.1.3.1
Divide by .
Step 2.2
Take the specified root of both sides of the equation to eliminate the exponent on the left side.
Step 2.3
Simplify .
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Step 2.3.1
Rewrite as .
Step 2.3.2
Pull terms out from under the radical, assuming positive real numbers.
Step 2.3.3
Plus or minus is .
Step 2.4
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
Step 2.5
Simplify the right side.
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Step 2.5.1
The exact value of is .
Step 2.6
Divide each term in by and simplify.
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Step 2.6.1
Divide each term in by .
Step 2.6.2
Simplify the left side.
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Step 2.6.2.1
Cancel the common factor of .
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Step 2.6.2.1.1
Cancel the common factor.
Step 2.6.2.1.2
Divide by .
Step 2.6.3
Simplify the right side.
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Step 2.6.3.1
Multiply the numerator by the reciprocal of the denominator.
Step 2.6.3.2
Cancel the common factor of .
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Step 2.6.3.2.1
Cancel the common factor.
Step 2.6.3.2.2
Rewrite the expression.
Step 2.7
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 2.8
Solve for .
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Step 2.8.1
Simplify.
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Step 2.8.1.1
To write as a fraction with a common denominator, multiply by .
Step 2.8.1.2
Combine and .
Step 2.8.1.3
Combine the numerators over the common denominator.
Step 2.8.1.4
Multiply by .
Step 2.8.1.5
Subtract from .
Step 2.8.2
Divide each term in by and simplify.
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Step 2.8.2.1
Divide each term in by .
Step 2.8.2.2
Simplify the left side.
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Step 2.8.2.2.1
Cancel the common factor of .
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Step 2.8.2.2.1.1
Cancel the common factor.
Step 2.8.2.2.1.2
Divide by .
Step 2.8.2.3
Simplify the right side.
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Step 2.8.2.3.1
Multiply the numerator by the reciprocal of the denominator.
Step 2.8.2.3.2
Cancel the common factor of .
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Step 2.8.2.3.2.1
Factor out of .
Step 2.8.2.3.2.2
Cancel the common factor.
Step 2.8.2.3.2.3
Rewrite the expression.
Step 2.9
Find the period of .
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Step 2.9.1
The period of the function can be calculated using .
Step 2.9.2
Replace with in the formula for period.
Step 2.9.3
is approximately which is positive so remove the absolute value
Step 2.9.4
Cancel the common factor of .
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Step 2.9.4.1
Cancel the common factor.
Step 2.9.4.2
Divide by .
Step 2.10
The period of the function is so values will repeat every radians in both directions.
, for any integer
Step 2.11
Consolidate the answers.
, for any integer
, for any integer
Step 3