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Question Number 33135 by Rio Mike last updated on 11/Apr/18

t h e t r i a n g l e w i t h v e r t i c e s A (- 1, - 3)

, B (2, 1), a n d C (- 2, 2), i s t r a n s f o r m e d

b y m a t r i x (\begin{matrix} a b \\ c d \end{matrix}) i n t o t h e t r i a n g l e w i t h v e r t i c e s

Missing \left or extra \right

a, b, c a n d d