绘制切线

def solve():
    import matplotlib.pyplot as plt
    import numpy as np
    x = np.linspace(____)
    f = lambda x: x**____
    df = lambda x: ____*x
    x0 = ____
    y0 = f(____)
    k = df(____)
    tangent = k * (____) + y0
    plt.figure(figsize=(____, ____))
    plt.plot(x, f(____), '____', label='____', linewidth=____)
    plt.plot(____)
    plt.scatter(____)
    plt.axhline(____, color='____', linewidth=____)
    plt.axvline(____, color='____', linewidth=____)
    plt.xlabel(____)
    plt.ylabel(____)
    plt.title(____)
    plt.legend()
    plt.grid(____)
    plt.show()