# Expand the Trigonometric Expression sin(a+b)+sin(a-b)

Expand the Trigonometric Expression sin(a+b)+sin(a-b)
Simplify each term.
Apply the sum of angles identity.
Apply the difference of angles identity.
Combine the opposite terms in .
Subtract from .
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### Name

Name two hundred ninety-one million nine hundred thirteen thousand three hundred twenty

### Interesting facts

• 291913320 has 128 divisors, whose sum is 1580078016
• The reverse of 291913320 is 023319192
• Previous prime number is 457

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 30
• Digital Root 3

### Name

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

### Interesting facts

• 2091265156 has 16 divisors, whose sum is 4909927104
• The reverse of 2091265156 is 6515621902
• Previous prime number is 23

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 37
• Digital Root 1

### Name

Name seventeen million seven hundred sixty-eight thousand nine hundred sixty-five

### Interesting facts

• 17768965 has 4 divisors, whose sum is 21322764
• The reverse of 17768965 is 56986771
• Previous prime number is 5

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 8
• Sum of Digits 49
• Digital Root 4