manualintegrate.py 文件源码

def eval_trig(func, arg, integrand, symbol):
    if func == 'sin':
        return -sympy.cos(arg)
    elif func == 'cos':
        return sympy.sin(arg)
    elif func == 'sec*tan':
        return sympy.sec(arg)
    elif func == 'csc*cot':
        return sympy.csc(arg)
    elif func == 'sec**2':
        return sympy.tan(arg)
    elif func == 'csc**2':
        return -sympy.cot(arg)