What is the right choice for question 1) ?

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### 1 Answer | Add Yours

y = a`cos(x-c)`

a - represents amplitude; c represents horizontal shift

therefore an amplitude of `(1/2)`

and a phase shift of `pi/4`

**means the equation should be: y = `(1/2)cos(x -pi/4)`**

**which is choice "b"**

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