A-Level Maths: E3-11 Trig Graphs: Quickly Sketching y = sin(x) in radians

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You just changed the way I draw graphs and its come such a long way.

Before I'd work in steps, trying to figure out where it crosses pi/2, then figure out where it crosses pi, then which significant x value comes after pi, figuring out that its 3pi/2, then whats after that, pi

The way you do it, is draw the graph first, find pi, then narrow down on the intervals after you've drawn the sketch which is so much easier.

Thank you as always.