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u mean, they arent compulsory?
I guess its not but i learned them and it helped me alot especially in Paper 1.
but there's a problem that most of the students mix up the matrix of shear with stretch and vise virsa and this can ruin their whole question of transformation so its better to solve the questions without it if u cant recall the correct matrix at the time of exam.
but definitely if they are on fingre tips then the questions will surely get easy.