Question

F (x) = cos x + sin x . find f(π/2) and f(π/4)

Answer 1

answer in the above picture.

Answer 2

Answer:

f(π/2) = 1

f(π/4) = √2

Step-by-step explanation:

We have been given that

f(x)= cosx + sinx

For  f(π/2), substitute x = π/2 in the equation

f(π/2) = cos (π/2) + sin (π/2)

f(π/2) = 0 +1

f(π/2) = 1

Now, for  f(π/4), substitute x = π/4 in the equation

f(π/4) = cos (π/4) + sin (π/4)

f(π/4) = 1/√2 + 1/√2

f(π/4) = 2/√2

f(π/4) = √2