Question

Evaluate f(x) = 2Sinx + cos(2x) if x =π/5

Answer 1

Answer:
`f((\pi)/(5))=1.485`Explanations:

The given function is:

f(x) = 2 sinx + cos (2x)

Since x = π/5, substitute π/5 into the given function.

`\begin{gathered} f((\pi)/(5))=\text{ 2 sin(}(\pi)/(5))+\cos \text{ (}(2\pi)/(5)) \\ f((\pi)/(5))\text{ = }2(0.588)\text{ + }0.309 \\ f((\pi)/(5))\text{ = }1.176+0.309 \\ f((\pi)/(5))\text{ = }1.485 \end{gathered}`