diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3389c86
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.zig-cache/
+zig-out/
diff --git a/src/main.zig b/src/main.zig
index 89cd135..c1c8dba 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -7,7 +7,6 @@ const SCREENHEIGHT = 1080;
 const SCALE = 50;
 
 pub fn main() !void {
-    // std.debug.print("{d}\n", .{SCREENWIDTH / 2});
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     defer _ = gpa.deinit();
     const allocator = gpa.allocator();
@@ -19,19 +18,17 @@ pub fn main() !void {
     rl.setTargetFPS(60);
     rl.beginDrawing();
 
-    rl.clearBackground(rl.Color.white);
+    rl.clearBackground(rl.Color.light_gray);
 
     plotGraph();
     drawAxis();
     try markAxis(allocator);
+    calculateArea();
 
     rl.endDrawing();
 
     while (!rl.windowShouldClose()) {
         rl.beginDrawing();
-        // DEBUG
-        // const pos = rl.getMousePosition();
-        // std.debug.print("x: {d} y:{}\n", .{ pos.x, pos.y });
         rl.endDrawing();
     }
 }
@@ -50,7 +47,7 @@ fn markAxis(allocator: std.mem.Allocator) !void {
     const font_size = 20;
     const start_x = SCREENWIDTH / 2;
     const start_y = SCREENHEIGHT / 2;
-    const radius = SCALE / 15;
+    const radius = 50 / 15;
     var buf: [20]u8 = undefined;
 
     var cnt: usize = 0;
@@ -131,7 +128,7 @@ fn plotGraph() void {
 
 // f(x)
 fn getY(x: f32) !f32 {
-    return math.calculate(x, -3, .Power);
+    return try math.calculate(x, 2, .Power) / -2 + 6;
 }
 
 fn adjustForGridSystem(input_vector: rl.Vector2) rl.Vector2 {
@@ -144,3 +141,7 @@ fn adjustForGridSystem(input_vector: rl.Vector2) rl.Vector2 {
 
     return new_vector;
 }
+
+fn calculateArea() void {
+    rl.drawText("Test", SCREENWIDTH - 75, 25, 20, rl.Color.red);
+}
diff --git a/src/math.zig b/src/math.zig
index 25825f5..99c75a8 100644
--- a/src/math.zig
+++ b/src/math.zig
@@ -15,11 +15,10 @@ pub fn calculate(first: f32, second: f32, op: MathOperation) !f32 {
             return first / second;
         },
         .Power => {
-            if (first == 0) std.debug.print("KOK", .{});
             if (first == 0 and second < 0) {
                 return error.InvalidParam;
             }
-            return pow(first, @intFromFloat(second));
+            return std.math.pow(f32, first, second);
         },
         .Root => {
             if (first < 0 or second < 0) {
@@ -37,23 +36,3 @@ fn abs(a: f32) f32 {
 
     return a;
 }
-
-fn pow(a: f32, b: i32) f32 {
-    var res: f32 = 1.0;
-    var n: usize = undefined;
-    var f: f32 = undefined;
-
-    if (b < 0) {
-        f = 1 / a;
-        n = @intCast(-b);
-    } else {
-        f = a;
-        n = @intCast(b);
-    }
-
-    for (0..n) |_| {
-        res *= f;
-    }
-
-    return res;
-}