SOLUTION: Use a sum or difference formula to find the exact value of the following. sin13π/18 cosπ/36 + cos13π/18 sinπ/36 =

Algebra ->  Trigonometry-basics -> SOLUTION: Use a sum or difference formula to find the exact value of the following. sin13π/18 cosπ/36 + cos13π/18 sinπ/36 =       Log On


   

Question 1042104: Use a sum or difference formula to find the exact value of the following.
sin13π/18 cosπ/36 + cos13π/18 sinπ/36 =
Answer by ikleyn(52786) About Me  (Show Source):
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Use a sum or difference formula to find the exact value of the following.
sin13π/18 cosπ/36 + cos13π/18 sinπ/36 =
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sin%2813pi%2F18%29%2Acos%28pi%2F36%29+%2B+cos%28%2813pi%29%2F18%29%2Asin%28pi%2F36%29 = sin%28%2813pi%29%2F18+%2B+pi%2F36%29 = sin%28%2826pi%29%2F36+%2B+pi%2F36%29 = sin%2827pi%2F36%29 = sin%28%283pi%29%2F4%29 = sqrt%282%29%2F2.

Regarding a sum or difference formula, see the lesson
    - Addition and subtraction formulas
in this site.