Graphing Sine and Cosine Functions

if sinx=0.3, determine the value of sinx+sin(x+2(3.14159))+sin(x+4(3.14159))

$sinx+sin (x+2\pi)+sin (x+4\pi)$

$= sin x+sinx+sinx$

$=3sinx$

$if \ sinx=0.3\ then$

$sinx+sin (x+2\pi)+sin (x+4\pi)$

${\color{blue}=3\times0.3 = 0.9}$    !