Expand Using Sum/Difference Formulas cos((2pi)/3)

Expand Using Sum/Difference Formulas cos((2pi)/3)
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 .
Simplify .
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 .
The exact value of is .
Simplify .
Apply the reference angle by finding the angle with equivalent trig values in the first quadrant.
The exact value of is .
Simplify each term.
Multiply by .
Multiply by .
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Name

Name one billion two hundred fourteen million fifteen thousand five hundred fifty-nine

Interesting facts

• 1214015559 has 4 divisors, whose sum is 1618687416
• The reverse of 1214015559 is 9555104121
• Previous prime number is 3

Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 33
• Digital Root 6

Name

Name one billion seven hundred eighty-four million three hundred eleven thousand three hundred twenty-three

Interesting facts

• 1784311323 has 8 divisors, whose sum is 2386832448
• The reverse of 1784311323 is 3231134871
• Previous prime number is 307

Basic properties

• Is Prime? no
• Number parity odd
• Number length 10
• Sum of Digits 33
• Digital Root 6

Name

Name eight hundred forty-three million three hundred forty-eight thousand two hundred twenty-four

Interesting facts

• 843348224 has 1024 divisors, whose sum is 21918988800
• The reverse of 843348224 is 422843348
• Previous prime number is 71

Basic properties

• Is Prime? no
• Number parity even
• Number length 9
• Sum of Digits 38
• Digital Root 2