def testfun(x):
    return 4*np.cos(x)-np.exp(x)

def dtest(x):
    return -4*np.sin(x)-np.exp(x)


an_sec=secant(testfun,guess=np.array([1,2])
an_new=newton(testfun, dtest,guess=[0])

File "<ipython-input-2-9f72cfc1af68>", line 8
    an_new=newton(testfun, dtest,guess=[0])
         ^
SyntaxError: invalid syntax