fix typos
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@@ -1173,7 +1173,7 @@ The sine function is an *odd* function.
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#| echo: false
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choices = ["odd", "even", "neither"]
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answer = 1
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explanation = "subsitute `-x` into the exponential formula to see"
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explanation = "substitute `-x` into the exponential formula to see"
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buttonq(choices, answer; explanation)
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```
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@@ -1185,7 +1185,7 @@ buttonq(choices, answer; explanation)
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#| echo: false
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choices = ["odd", "even", "neither"]
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answer = 2
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explanation = L"The value of $\cosh(-x)$ is the $y$ position of the point $(x,y)$ refelected through the $y$ axis, so is unchanged."
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explanation = L"The value of $\cosh(-x)$ is the $y$ position of the point $(x,y)$ reflected through the $y$ axis, so is unchanged."
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buttonq(choices, answer; explanation)
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```
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