diff --git a/frontend/js/labs/trigcircle.js b/frontend/js/labs/trigcircle.js
index 913583c..6dce28d 100644
--- a/frontend/js/labs/trigcircle.js
+++ b/frontend/js/labs/trigcircle.js
@@ -688,15 +688,19 @@ class TrigCircleSim {
       c.beginPath(); c.moveTo(x0, gy); c.lineTo(x0, gy+gh); c.stroke();
     }
 
-    /* ±1 lines */
-    if (fn==='sin'||fn==='cos') {
-      c.strokeStyle = 'rgba(255,255,255,0.05)'; c.setLineDash([4, 4]);
-      [1,-1].forEach(v => { c.beginPath(); c.moveTo(gx, sy(v)); c.lineTo(gx+gw, sy(v)); c.stroke(); });
-      c.setLineDash([]);
-      c.font='500 10px Manrope,sans-serif'; c.fillStyle='rgba(255,255,255,0.22)';
-      c.textAlign='right'; c.textBaseline='middle';
-      c.fillText('1', gx-5, sy(1)); c.fillText('−1', gx-5, sy(-1));
-    }
+    /* ── шкала значений по оси Y (значения на координатной плоскости) ── */
+    const yVals = (fn==='tan'||fn==='cot')
+      ? [[3,'3'],[2,'2'],[1,'1'],[0,'0'],[-1,'-1'],[-2,'-2'],[-3,'-3']]
+      : [[1,'1'],[0.5,'\\tfrac{1}{2}'],[0,'0'],[-0.5,'-\\tfrac{1}{2}'],[-1,'-1']];
+    yVals.forEach(([v, lx], i) => {
+      const yy = sy(v);
+      if (yy < gy + 6 || yy > gy + gh - 6) return;
+      if (v !== 0) {
+        c.strokeStyle = 'rgba(255,255,255,0.05)'; c.lineWidth = 1; c.setLineDash([4, 4]);
+        c.beginPath(); c.moveTo(gx, yy); c.lineTo(gx+gw, yy); c.stroke(); c.setLineDash([]);
+      }
+      this._ovLabel('gy' + i, lx, gx - 6, yy, 'rgba(255,255,255,0.55)', 'r');
+    });
 
     /* x ticks — линии на canvas, подписи KaTeX-оверлеем */
     const ticks = [[0, '0'], [Math.PI/2, '\\tfrac{\\pi}{2}'], [Math.PI, '\\pi'],