Understanding the Direction Field of y'=cos(πx)

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This isn't a home work, so only I'm posting here

When we solve y'=cos(πx) we'll get y=sin(πx)/π +C. But plotting direction field seems little confusing for me

Since y' is a function of cosine , the value of y' must be within [-1,1].

If i took y' as 0 and tried to plot it and I'm getting set of points such as (...-2.5, -1.5, -0.5, 0.5, 1.5, 2.5,...)

I can't draw a isocline since here it is discontinuois.

Similarly by setting y' has 1, -1 we'll get points such as (...-4, -2, 0, 2, 4...) & (...-5, -3, -1, 1, 3, 5...)

Now how the solution curve should be plotted from the direction field, without isocline (i mean here isocline is just set of points not a curve)...
 
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Thread 'Direction Fields and Isoclines'
I sketched the isoclines for $$ m=-1,0,1,2 $$. Since both $$ \frac{dy}{dx} $$ and $$ D_{y} \frac{dy}{dx} $$ are continuous on the square region R defined by $$ -4\leq x \leq 4, -4 \leq y \leq 4 $$ the existence and uniqueness theorem guarantees that if we pick a point in the interior that lies on an isocline there will be a unique differentiable function (solution) passing through that point. I understand that a solution exists but I unsure how to actually sketch it. For example, consider a...
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