# Expand Using Sum/Difference Formulas cos(a-B)+cos(a+B)

Expand Using Sum/Difference Formulas cos(a-B)+cos(a+B)
Use the difference formula for cosine to simplify the expression. The formula states that .
Remove parentheses.
Multiply by .
Use the sum formula for cosine to simplify the expression. The formula states that .
Remove parentheses.
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### Name

Name one billion nine hundred ninety-eight million four hundred thousand nine hundred fourteen

### Interesting facts

• 1998400914 has 16 divisors, whose sum is 5329069152
• The reverse of 1998400914 is 4190048991
• Previous prime number is 3

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 45
• Digital Root 9

### Name

Name one billion five hundred eighty-two million nine hundred twenty-two thousand twenty-eight

### Interesting facts

• 1582922028 has 16 divisors, whose sum is 4748766120
• The reverse of 1582922028 is 8202292851
• Previous prime number is 3

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 39
• Digital Root 3

### Name

Name nine hundred seventy-four million nine hundred forty-three thousand two hundred sixty-one

### Interesting facts

• 974943261 has 8 divisors, whose sum is 1089917760
• The reverse of 974943261 is 162349479
• Previous prime number is 163

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 9
• Sum of Digits 45
• Digital Root 9