# Expand Using Sum/Difference Formulas cos(u+pi)

Expand Using Sum/Difference Formulas cos(u+pi)
Use the sum formula for cosine to simplify the expression. The formula states that .
Remove parentheses.
Simplify each term.
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 second quadrant.
The exact value of is .
Multiply by .
Rewrite as .
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.
The exact value of is .
Multiply by .
Multiply by .
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### Name

Name one billion three hundred sixty-seven million two hundred seventy-seven thousand two hundred seventy-nine

### Interesting facts

• 1367277279 has 8 divisors, whose sum is 1825856640
• The reverse of 1367277279 is 9727727631
• Previous prime number is 647

### Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 51
• Digital Root 6

### Name

Name six hundred two million eight hundred fifty-six thousand five hundred ninety-eight

### Interesting facts

• 602856598 has 8 divisors, whose sum is 917021520
• The reverse of 602856598 is 895658206
• Previous prime number is 71

### Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 49
• Digital Root 4

### Name

Name one billion eight hundred sixteen million three hundred ninety-nine thousand three hundred seventy-six

### Interesting facts

• 1816399376 has 128 divisors, whose sum is 10054756800
• The reverse of 1816399376 is 6739936181
• Previous prime number is 439

### Basic properties

• Is Prime? no
• Number parity even
• Number length 10
• Sum of Digits 53
• Digital Root 8