# Find the Exact Value cos(225)

Find the Exact Value cos(225)
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 is .
The result can be shown in multiple forms.
Exact Form:
Decimal Form:
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### Name

Name one billion forty-two million six hundred forty-seven thousand five hundred fifty-eight

### Interesting facts

• 1042647558 has 8 divisors, whose sum is 2085295128
• The reverse of 1042647558 is 8557462401
• Previous prime number is 3

### Basic properties

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

### Name

Name one billion two hundred fifty-six million one hundred sixty-five thousand seven hundred sixty-nine

### Interesting facts

• 1256165769 has 32 divisors, whose sum is 1825182720
• The reverse of 1256165769 is 9675616521
• Previous prime number is 107

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 48
• Digital Root 3

### Name

Name seven hundred eighty-seven million three hundred fifty-one thousand one hundred twenty-five

### Interesting facts

• 787351125 has 8 divisors, whose sum is 819574912
• The reverse of 787351125 is 521153787
• Previous prime number is 25

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 9
• Sum of Digits 39
• Digital Root 3