13 .   L e t   f 1 g :   R R   b e   d e f i n e d   r e s p e c t i v e l y   b y   f x = x + 1 ,   g x = 2 x + 3 . F i n d   f + g , f - g   ,   f g   a n d   f . g O R C o n v e r t   t h e   c o m p l e x   n u m b e r   - 16 1 + i 3   i n t o   p o l a r   f o r m .

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