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1) a. For what values of t does x=4t3-12t2+5 & y=t3-9t2+24t+1 have horizontal and vertical tangent...

1) a. For what values of t does x=4t3-12t2+5 & y=t3-9t2+24t+1 have horizontal and vertical tangent lines?

b. **Find parametric & rectangular equations for the tangent line at t= -1.**

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