# Expand Using Sum/Difference Formulas cos(45)

Expand Using Sum/Difference Formulas cos(45)
The angle is an angle where the values of the six trigonometric functions are known. Because this is the case, add to keep the value the same.
Use the sum formula for cosine to simplify the expression. The formula states that .
The exact value of is .
The exact value of is .
The exact value of is .
The exact value of is .
Simplify each term.
Multiply by .
Multiply by .
The result can be shown in multiple forms.
Exact Form:
Decimal Form:
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### Name

Name one hundred ninety-seven million three hundred forty-eight thousand seven hundred thirty

### Interesting facts

• 197348730 has 16 divisors, whose sum is 473637024
• The reverse of 197348730 is 037843791
• Previous prime number is 5

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 42
• Digital Root 6

### Name

Name three hundred six million eight hundred seventeen thousand one hundred forty-four

### Interesting facts

• 306817144 has 32 divisors, whose sum is 1035896040
• The reverse of 306817144 is 441718603
• Previous prime number is 10837

### Basic properties

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

### Name

Name five hundred ninety-one million seven hundred eighty-two thousand five hundred eleven

### Interesting facts

• 591782511 has 4 divisors, whose sum is 789043352
• The reverse of 591782511 is 115287195
• Previous prime number is 3

### Basic properties

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