1) Give the exact value of the following: 4cos(π/4)
2) Evaluate the following expression when x is π/4. Use the exact value:
5cos(2x)
3) For the following expression, find the value of y that corresponds to each value of x, then write your results as ordered pairs (x, y). (Enter your answers from smallest to largest x-value.)
y=1/4cos(x)
x=0, π/2, π, 3π/2, 2π
thxs!
for 1) thats as far as i got then i stopped cause i didnt know how im suspose to cross mutiple the 4 and root2 *edit nvm im so sleep deproved right now i got the answer now....*
as for 2) its the same thing i got that far and then i got stuck because how do i find a cos of pi/2 is pi/2 is the 90 degree angle?