SOLUTION: How to solve cos(3pi+pi/4)

Algebra ->  Trigonometry-basics -> SOLUTION: How to solve cos(3pi+pi/4)      Log On


   

Question 1037444: How to solve cos(3pi+pi/4)
Found 2 solutions by thesvw, ikleyn:
Answer by thesvw(77) About Me  (Show Source):
You can put this solution on YOUR website!
cos%283pi%2Bpi%2F4%29=+cos%283pi%29%2Acos%28pi%2F4%29+-+sin%283pi%29%2Asin%28pi%2F4%29
= (-1)(1/sqrt( 2 )) - 0(1/sqrt( 2 ))
= -(1/sqrt( 2 ))
sqrt means sqare root.

Answer by ikleyn(52798) About Me  (Show Source):