Solve for x cos(x)=-1

Solve for x 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.
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The period of the function can be calculated using .
Replace with in the formula for period.
Solve the equation.
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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 three hundred seventy-five million nine hundred forty-two thousand five hundred eighty-seven

Interesting facts

  • 1375942587 has 4 divisors, whose sum is 1834590120
  • The reverse of 1375942587 is 7852495731
  • Previous prime number is 3

Basic properties

  • Is Prime? no
  • Number parity odd
  • Number length 10
  • Sum of Digits 51
  • Digital Root 6

Name

Name five hundred fifteen million seventy-nine thousand nine hundred thirty

Interesting facts

  • 515079930 has 32 divisors, whose sum is 1301256000
  • The reverse of 515079930 is 039970515
  • Previous prime number is 19

Basic properties

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

Name

Name one hundred seventy-nine million eighty-two thousand one hundred fifteen

Interesting facts

  • 179082115 has 4 divisors, whose sum is 214898544
  • The reverse of 179082115 is 511280971
  • Previous prime number is 5

Basic properties

  • Is Prime? no
  • Number parity odd
  • Number length 9
  • Sum of Digits 34
  • Digital Root 7