4.5 tan

#include "stdafx.h"
#include <iostream>
#include <Windows.h>
#include <cmath>

using namespace std;

const float PI = 3.14;

int main() {
    HWND hWnd = GetConsoleWindow(); //дескриптор окна
    HDC hDC = GetDC(hWnd); //дескриптор контекста устройства
    HPEN Pen = CreatePen(PS_SOLID, 2, RGB(255, 255, 255));

    float scale = 30;

    POINT horizontalAxisCoordinates = { 25, 230 };
    POINT horizontalLineCoordinates = { 500, horizontalAxisCoordinates.y };

    POINT verticalAxisCoordinates = { 250, 50 };
    POINT verticalLineCoordinates = { verticalAxisCoordinates.x, 390 };

    SelectObject(hDC, Pen);

    MoveToEx(hDC, horizontalAxisCoordinates.x, horizontalAxisCoordinates.y, NULL);
    LineTo(hDC, horizontalLineCoordinates.x, horizontalLineCoordinates.y);

    MoveToEx(hDC, verticalAxisCoordinates.x, verticalAxisCoordinates.y, NULL);
    LineTo(hDC, verticalLineCoordinates.x, verticalLineCoordinates.y);

    for (float x = -PI/2; x <= PI/2; x += 0.01)
    {
        MoveToEx(hDC, (int)(scale * x +250), (int)(-scale * tan(x) + 230), NULL);
        LineTo(hDC, (int)(scale * x + 250), (int)(-scale * tan(x) + 230));
    }

    ReleaseDC(hWnd, hDC);
}