Take the cosine of <math><mstyle displaystyle="true"><mo>-</mo><mfrac><mrow><mn>5</mn><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac></mstyle></math> .

Add full rotations of <math><mstyle displaystyle="true"><mn>2</mn><mi>π</mi></mstyle></math> until the angle is greater than or equal to <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> and less than <math><mstyle displaystyle="true"><mn>2</mn><mi>π</mi></mstyle></math> .

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 third quadrant.

The exact value of <math><mstyle displaystyle="true"><mi>cos</mi><mrow><mo>(</mo><mfrac><mrow><mi>π</mi></mrow><mrow><mn>6</mn></mrow></mfrac><mo>)</mo></mrow></mstyle></math> is <math><mstyle displaystyle="true"><mfrac><mrow><msqrt><mn>3</mn></msqrt></mrow><mrow><mn>2</mn></mrow></mfrac></mstyle></math> .

The result can be shown in multiple forms.

Exact Form:

Decimal Form:

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Name | nine hundred twenty-four million two hundred eighty-seven thousand three hundred seventy-five |
---|

- 924287375 has 32 divisors, whose sum is
**1742368320** - The reverse of 924287375 is
**573782429** - Previous prime number is
**5**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 47
- Digital Root 2

Name | three hundred eighty-nine million two hundred eighty-two thousand three |
---|

- 389282003 has 8 divisors, whose sum is
**435029616** - The reverse of 389282003 is
**300282983** - Previous prime number is
**41**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 35
- Digital Root 8

Name | eight hundred sixty-three million seven hundred fifty-five thousand three hundred eighty-nine |
---|

- 863755389 has 32 divisors, whose sum is
**1264688640** - The reverse of 863755389 is
**983557368** - Previous prime number is
**113**

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