# Solve for ? cos(x)=-1

Solve for ? cos(x)=-1
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 one hundred six million one hundred one thousand four hundred eighty-seven

### Interesting facts

• 1106101487 has 4 divisors, whose sum is 1154192880
• The reverse of 1106101487 is 7841016011
• Previous prime number is 23

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 29
• Digital Root 2

### Name

Name three hundred ninety-eight million five hundred eight thousand five hundred sixty-two

### Interesting facts

• 398508562 has 8 divisors, whose sum is 597958092
• The reverse of 398508562 is 265805893
• Previous prime number is 3221

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 46
• Digital Root 1

### Name

Name eight hundred ninety-five million four hundred fifty-seven thousand one hundred thirty-eight

### Interesting facts

• 895457138 has 8 divisors, whose sum is 1375946460
• The reverse of 895457138 is 831754598
• Previous prime number is 41

### Basic properties

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