Find the Exact Value 2cos(157.5)^2-1

Find the Exact Value 2cos(157.5)^2-1
Apply the cosine double-angle identity.
Multiply by .
The result can be shown in multiple forms.
Exact Form:
Decimal Form:
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Name

Name six hundred forty-six million eight hundred thousand seven hundred ninety-five

Interesting facts

  • 646800795 has 8 divisors, whose sum is 785743680
  • The reverse of 646800795 is 597008646
  • Previous prime number is 81

Basic properties

  • Is Prime? no
  • Number parity odd
  • Number length 9
  • Sum of Digits 45
  • Digital Root 9

Name

Name six hundred thirty-three million two hundred forty-one thousand five

Interesting facts

  • 633241005 has 16 divisors, whose sum is 1036749120
  • The reverse of 633241005 is 500142336
  • Previous prime number is 43

Basic properties

  • Is Prime? no
  • Number parity odd
  • Number length 9
  • Sum of Digits 24
  • Digital Root 6

Name

Name one billion two hundred twenty-one million five hundred seventy-one thousand four hundred sixty-one

Interesting facts

  • 1221571461 has 16 divisors, whose sum is 1350216000
  • The reverse of 1221571461 is 1641751221
  • Previous prime number is 2393

Basic properties

  • Is Prime? no
  • Number parity odd
  • Number length 10
  • Sum of Digits 30
  • Digital Root 3