# 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 one billion five hundred eighty million nine hundred seventy-two thousand three hundred seventy-eight

### Interesting facts

• 1580972378 has 32 divisors, whose sum is 2453371200
• The reverse of 1580972378 is 8732790851
• Previous prime number is 113

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 50
• Digital Root 5

### Name

Name one billion three hundred sixty-seven million six hundred forty-eight thousand nine hundred eighty-two

### Interesting facts

• 1367648982 has 64 divisors, whose sum is 3567306240
• The reverse of 1367648982 is 2898467631
• Previous prime number is 37

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 54
• Digital Root 9

### Name

Name four hundred thirty-four million one hundred fifteen thousand nine hundred ninety-three

### Interesting facts

• 434115993 has 16 divisors, whose sum is 602262720
• The reverse of 434115993 is 399511434
• Previous prime number is 29

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 9
• Sum of Digits 39
• Digital Root 3