exam Maths Puzzle Numerical Ability

a^-1 - a/a^-2 - 1

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Currently, Person A has $60 and Person B has $135. Person A decides to save $5 of his/her paycheck each week, while Person B decides to spend all of his/her paycheck and an additio The lengths of the sides of triangle ABC are AB=6, BC=4, and CA=5, then cos A=?