Move the negative in front of the fraction.

Add full rotations of <math><mstyle displaystyle="true"><mn>2</mn><mi>π</mi></mstyle></math> until the angle is between <math><mstyle displaystyle="true"><mn>0</mn></mstyle></math> and <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>4</mn></mrow></mfrac><mo>)</mo></mrow></mstyle></math> is <math><mstyle displaystyle="true"><mfrac><mrow><msqrt><mn>2</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 | two hundred twenty-seven million four hundred fifty-seven thousand five hundred four |
---|

- 227457504 has 256 divisors, whose sum is
**2309608080** - The reverse of 227457504 is
**405754722** - Previous prime number is
**369**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 36
- Digital Root 9

Name | five hundred eighty-eight million seven hundred thirty-seven thousand fifty-eight |
---|

- 588737058 has 32 divisors, whose sum is
**1060160640** - The reverse of 588737058 is
**850737885** - Previous prime number is
**403**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 51
- Digital Root 6

Name | one billion nine hundred two million fifty-three thousand seven hundred forty-three |
---|

- 1902053743 has 4 divisors, whose sum is
**1908545688** - The reverse of 1902053743 is
**3473502091** - Previous prime number is
**293**

- Is Prime? no
- Number parity odd
- Number length 10
- Sum of Digits 34
- Digital Root 7