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.

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:

Do you know how to Find the Reference Angle cos(-pi/4)? If not, you can write to our math experts in our application. The best solution for your task you can find above on this page.

Name | one billion eight hundred fifty-one million forty-three thousand six hundred ten |
---|

- 1851043610 has 16 divisors, whose sum is
**2916504360** - The reverse of 1851043610 is
**0163401581** - Previous prime number is
**29**

- Is Prime? no
- Number parity even
- Number length 10
- Sum of Digits 29
- Digital Root 2

Name | one hundred two million two hundred seventy-eight thousand four hundred forty |
---|

- 102278440 has 32 divisors, whose sum is
**351467424** - The reverse of 102278440 is
**044872201** - Previous prime number is
**55**

- Is Prime? no
- Number parity even
- Number length 9
- Sum of Digits 28
- Digital Root 1

Name | one billion ninety-eight million four hundred sixty thousand three hundred fourteen |
---|

- 1098460314 has 32 divisors, whose sum is
**3347688960** - The reverse of 1098460314 is
**4130648901** - Previous prime number is
**3**

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