Find the Cosine of the Angle -(4pi)/3

Find the Cosine of the Angle -(4pi)/3
Take the cosine of .
Add full rotations of until the angle is greater than or equal to and less than .
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because cosine is negative in the second quadrant.
The exact value of is .
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Name

Name two hundred forty-one million six hundred twenty-four thousand twenty-nine

Interesting facts

  • 241624029 has 16 divisors, whose sum is 331478784
  • The reverse of 241624029 is 920426142
  • Previous prime number is 233

Basic properties

  • Is Prime? no
  • Number parity odd
  • Number length 9
  • Sum of Digits 30
  • Digital Root 3

Name

Name seven hundred sixty-five million three hundred twenty thousand nine hundred forty-four

Interesting facts

  • 765320944 has 64 divisors, whose sum is 3885441696
  • The reverse of 765320944 is 449023567
  • Previous prime number is 135503

Basic properties

  • Is Prime? no
  • Number parity even
  • Number length 9
  • Sum of Digits 40
  • Digital Root 4

Name

Name nine hundred seventy-one million nine hundred eighty-one thousand nine hundred fifty-five

Interesting facts

  • 971981955 has 64 divisors, whose sum is 1504419840
  • The reverse of 971981955 is 559189179
  • Previous prime number is 23

Basic properties

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