Finite Math Examples

Solve by Substitution r=4sin(x) , r=4cos(x)
,
Step 1
Eliminate the equal sides of each equation and combine.
Step 2
Solve for .
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Step 2.1
Divide each term in the equation by .
Step 2.2
Separate fractions.
Step 2.3
Convert from to .
Step 2.4
Divide by .
Step 2.5
Cancel the common factor of .
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Step 2.5.1
Cancel the common factor.
Step 2.5.2
Divide by .
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
Divide by .
Step 2.7
Take the inverse tangent of both sides of the equation to extract from inside the tangent.
Step 2.8
Simplify the right side.
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Step 2.8.1
The exact value of is .
Step 2.9
The tangent function is positive in the first and third quadrants. To find the second solution, add the reference angle from to find the solution in the fourth quadrant.
Step 2.10
Simplify .
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Step 2.10.1
To write as a fraction with a common denominator, multiply by .
Step 2.10.2
Combine fractions.
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Step 2.10.2.1
Combine and .
Step 2.10.2.2
Combine the numerators over the common denominator.
Step 2.10.3
Simplify the numerator.
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Step 2.10.3.1
Move to the left of .
Step 2.10.3.2
Add and .
Step 2.11
Find the period of .
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Step 2.11.1
The period of the function can be calculated using .
Step 2.11.2
Replace with in the formula for period.
Step 2.11.3
The absolute value is the distance between a number and zero. The distance between and is .
Step 2.11.4
Divide by .
Step 2.12
The period of the function is so values will repeat every radians in both directions.
, for any integer
, for any integer
Step 3
Evaluate when .
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Step 3.1
Substitute for .
Step 3.2
Remove parentheses.
Step 4
Evaluate when .
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Step 4.1
Substitute for .
Step 4.2
Remove parentheses.
Step 5
The solution of the system of equations is all the values that make the system true.
Step 6
List all of the solutions.