Question 406414
What are the points at x=-4, x=0, and x=4 on the graph y=4sin(2x+(3.14/4))?
use functional notation
f(x)=4sin(2x+(3.14/4))

Make sure your calculator set to radians instead of degrees.
f(0)=4sin(0+(3.14/4))=2.828
f(-4)=4sin(-8+(3.14/4))=
     =4sin(-7.215)=-3.21
f(4) =4sin(8+(3.14/4))
     =4sin(8.785)=2.388

ans:
f(0)=2.828
f(-4)=-3.21
f(4)=2.388

see the graph below

{{{ graph( 300, 200, -6, 6, -5, 5, 4sin(2x+(3.14/4))) }}}