SOLUTION: Write the expression as a single real number. Do not use decimal approximations. cos(3pi/4) cos(pi)+ sin(3pi/4) sin(pi)

Algebra ->  Trigonometry-basics -> SOLUTION: Write the expression as a single real number. Do not use decimal approximations. cos(3pi/4) cos(pi)+ sin(3pi/4) sin(pi)      Log On


   

Question 595438: Write the expression as a single real number. Do not use decimal approximations.
cos(3pi/4) cos(pi)+ sin(3pi/4) sin(pi)
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
cos(3pi/4) cos(pi)+ sin(3pi/4) sin(pi)

(-sqrt(2)/2)(-1)+ (sqrt(2)/2)(0)

sqrt(2)/2

So