Hi need some help differentiating please! How can I do this ?

Either use the "quotient rule" or write the function as \(\displaystyle y= t(t- 1)^{-2}\) and "product rule" and "chain rule".
 
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The main rule is the product rule since t * (t - 1)-2 . Personally i would use the quotient rule as the main rule by leaving the problem as y = t / (t - 1)2
 
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