# Expand Using Sum/Difference Formulas sin(15)

Expand Using Sum/Difference Formulas sin(15)
First, split the angle into two angles where the values of the six trigonometric functions are known. In this case, can be split into .
Use the difference formula for sine 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 .
Multiply and .
Combine using the product rule for radicals.
Multiply by .
Multiply by .
Multiply .
Multiply and .
Multiply by .
Combine the numerators over the common denominator.
The result can be shown in multiple forms.
Exact Form:
Decimal Form:
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### Name

Name one billion six hundred thirty-eight million one hundred nineteen thousand nine hundred two

### Interesting facts

• 1638119902 has 8 divisors, whose sum is 2457421200
• The reverse of 1638119902 is 2099118361
• Previous prime number is 68489

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 40
• Digital Root 4

### Name

Name nine hundred eighteen million nine hundred twenty-two thousand four hundred thirty-four

### Interesting facts

• 918922434 has 8 divisors, whose sum is 1837844880
• The reverse of 918922434 is 434229819
• Previous prime number is 3

### Basic properties

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

### Name

Name four hundred forty-six million four hundred sixty-six thousand six hundred eighty-two

### Interesting facts

• 446466682 has 8 divisors, whose sum is 709094196
• The reverse of 446466682 is 286664644
• Previous prime number is 17

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 46
• Digital Root 1