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 | three hundred eighteen million eight hundred forty-five thousand eight hundred sixty-five |
---|

- 318845865 has 16 divisors, whose sum is
**378900480** - The reverse of 318845865 is
**568548813** - Previous prime number is
**29**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 48
- Digital Root 3

Name | one billion four hundred million eighty-four thousand five hundred forty-eight |
---|

- 1400084548 has 8 divisors, whose sum is
**3150190242** - The reverse of 1400084548 is
**8454800041** - Previous prime number is
**2**

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

Name | four hundred sixty-six million one hundred twenty-two thousand five hundred seventy-seven |
---|

- 466122577 has 4 divisors, whose sum is
**486388800** - The reverse of 466122577 is
**775221664** - Previous prime number is
**23**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 40
- Digital Root 4