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 <math><mstyle displaystyle="true"><mi>cos</mi><mrow><mo>(</mo><mn>45</mn><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 | one billion nine hundred seventy-two million three thousand seven hundred twenty-five |
---|

- 1972003725 has 32 divisors, whose sum is
**2843917440** - The reverse of 1972003725 is
**5273002791** - Previous prime number is
**409**

- Is Prime? no
- Number parity odd
- Number length 10
- Sum of Digits 36
- Digital Root 9

Name | eighty-one million eight hundred sixty-eight thousand eight hundred twenty-two |
---|

- 81868822 has 32 divisors, whose sum is
**148552704** - The reverse of 81868822 is
**22886818** - Previous prime number is
**71**

- Is Prime? no
- Number parity even
- Number length 8
- Sum of Digits 43
- Digital Root 7

Name | three hundred eighty-eight million six hundred seventy-three thousand nine hundred sixty-five |
---|

- 388673965 has 8 divisors, whose sum is
**466518240** - The reverse of 388673965 is
**569376883** - Previous prime number is
**6779**

- Is Prime? no
- Number parity odd
- Number length 9
- Sum of Digits 55
- Digital Root 1