ex-4: change the order of the entries of the definition of atan()
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@ -100,8 +100,8 @@ where:
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$$
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$$
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\begin{cases}
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\begin{cases}
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\arctan(P_h/P_v) &\incase P_v > 0 \\
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\arctan(P_h/P_v) &\incase P_v > 0 \\
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\arctan(P_h/P_v) + \pi &\incase P_v < 0 \\
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\pi/2 &\incase P_v = 0 \\
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\pi/2 &\incase P_v = 0
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\arctan(P_h/P_v) + \pi &\incase P_v < 0
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\end{cases}
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\end{cases}
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$$
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$$
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