# Find the Cosine of the Angle -(4pi)/3

Find the Cosine of the Angle -(4pi)/3
Take the cosine of .
Add full rotations of until the angle is greater than or equal to and less than .
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 is .
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### Name

Name four hundred sixty-eight million one hundred sixteen thousand six hundred twenty

### Interesting facts

• 468116620 has 32 divisors, whose sum is 1285340400
• The reverse of 468116620 is 026611864
• Previous prime number is 59

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 34
• Digital Root 7

### Name

Name one billion six hundred seventy-four million one hundred twenty-eight thousand fifteen

### Interesting facts

• 1674128015 has 32 divisors, whose sum is 2349527040
• The reverse of 1674128015 is 5108214761
• Previous prime number is 47

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 35
• Digital Root 8

### Name

Name one billion eighteen million nine hundred fifteen thousand six hundred forty-seven

### Interesting facts

• 1018915647 has 4 divisors, whose sum is 1358554200
• The reverse of 1018915647 is 7465198101
• Previous prime number is 3

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 42
• Digital Root 6