'''def notify(msg):
    _.notify(msg)

def ask(msg):
    return _.ask(msg)

def diff(fun,var):
    return _.diff(fun,var)

def integrate(fun,var):
    return _.integrate(fun,var)

def rad(num):
    return _.rad(num)

def deg(num):
    return _.deg(num)

def subs(fun,var):
    return _.subs(fun,var)

def plot():
    _.plot()

def plot(fun):
    _.plot(fun)

def plotname(fun):
    _.plotname(fun)

def plotname():
    return _.plotname()

def xlim(min,max):
    _.xlim(min,max)

def plotclr():
    _.plotclr()

def drawdot(x, y):
    _.drawdot(x, y)
'''