# Solve for ? cos(theta)+1=0

Solve for ? cos(theta)+1=0
Subtract from both sides of the equation.
Take the inverse cosine of both sides of the equation to extract from inside the cosine.
The exact value of is .
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.
Subtract from .
Find the period.
The period of the function can be calculated using .
Replace with in the formula for period.
Solve the equation.
The absolute value is the distance between a number and zero. The distance between and is .
Divide by .
The period of the function is so values will repeat every radians in both directions.
, for any integer
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### Name

Name three million six hundred eighty-five thousand six

### Interesting facts

• 3685006 has 8 divisors, whose sum is 5952744
• The reverse of 3685006 is 6005863
• Previous prime number is 13

### Basic properties

• Is Prime? no
• Number parity even
• Number length 7
• Sum of Digits 28
• Digital Root 1

### Name

Name one billion seven hundred forty-eight million fifty-eight thousand one hundred ninety-six

### Interesting facts

• 1748058196 has 16 divisors, whose sum is 3951773280
• The reverse of 1748058196 is 6918508471
• Previous prime number is 211

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 49
• Digital Root 4

### Name

Name four hundred seventy-eight million six hundred eighty-six thousand five hundred twenty-four

### Interesting facts

• 478686524 has 16 divisors, whose sum is 1077634800
• The reverse of 478686524 is 425686874
• Previous prime number is 1879

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 50
• Digital Root 5