Question

In Exercises 9 and 10, find an equation for the line in the xy-plane that is tangent to the curve at the point corresponding to the given value of t. Also, find the value of d2y/dx2 at this point. 9. x = (1/2) tan t, y = (1/2) sec t; t = pai/3 10. x = 1 + 1/t2, y = 1 - 3/t; t =2

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