How do you graph $sin x + 2 sin x$ ?

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Answer 1 · 2016-02-23T15:27:42

This is simply the graph of $sin(x)$ with the amplitude stretched to $[-3,+3]$

$sin(x)+2sin(x)= 3 sin(x)$
$sin(0)=0 rArr 3 sin(0)=0$
$sin(pi/2)=1 rArr 3 sin(pi/2)=3$
etc.
graph{3sin(x) [-5.986, 6.504, -3.1, 3.144]}

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