Ask Me Help Desk - Show that the set SL(R,2) is a subgroup of {GL(R,2),*}

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Show that the set SL(R,2) is a subgroup of {GL(R,2),*}

where SL(R,2) is the matrix [a b] | a, b, c, d belongs to the set of reals, ad - because = 1.
[c d]

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