oints[j][0]) / (points[i][0] - points[j][0]);
		}
		return yi;
	}
	init_atan_plot(document.getElementById("basis_canvas"), [basis, function(x) {return 1;}], ["#005500", "#999999"], [], 0., 0., 4, 640, 640, false, false, true);
	</script>
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