программа игнорит ветку elif и лепит все в if

def calc_pro():
    while True:
        try:

            a = float(input('first number: '))
            operation = input('+ - * / tg ctg cos sin: ')
            b = float(input('second number: '))
            round_to = int(input('round to item after coma: '))
            operations = {

                '+': round(a + b, round_to),
                '-': round(a - b, round_to),
                '*': round(a * b, round_to),
                '/': round(a / b, round_to),
                'tg': round(math.tan(a), round_to),
                'cos': round(math.cos(a), round_to),
                'sin': round(math.sin(a), round_to),
                'ctg': round(math.cos(a) / math.sin(a), round_to),
            }

            if operation == '+' or '-' or '*' or '/':
                print('{} {} {} = {}'.format(a, operation, b, operations[operation]))
            elif operation == 'tg' or 'ctg' or 'cos' or 'sin':
                print('{} {}  = {}'.format(operation, a, operations[operation]))