Find an equation for the line tangent to the curve at the point defined by the given value of t.

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1. First, we need to find the coordinates of the point on the curve at t = 3. We are given x = s

Find an equation for the line tangent to the curve at the point defined by the given value of t. Also, find the value of d^2y/dx^2 at this point. x = sec t, y = cos t; t = pi/3 Write the equation of the tangent line. y = []x + [] (Type exact answers, using radicals as needed.)