How do you graph $y = 2 cos 2 x$ $y=2cos2x$ ?

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How do you graph $y = 2 cos 2 x$ $y=2cos2x$ ?

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Answer 1 · 2015-04-19T01:24:25

You can deduce a lot of things from the equation representing your function.

It is a cosine with amplitude of $2$ $2$ and a length $λ$ $lambda$ (before it repeats itself) that can be found using the $2$ $2$ in front of $x$ $x$ as the value of $k$ $k$ in:

$k = \frac{2 π}{λ}$ $k=(2pi)/lambda$

giving: $λ = π$ $lambda=pi$ basically it is a squashed cosine function that instead of going from $0$ $0$ to $2 π$ $2pi$ goes from $0$ $0$ to $π$ $pi$ :
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How do you graph $y = 2 cos 2 x$ $y=2cos2x$ ?

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