1. Find an equation for the line in the xy?plane that is tangent to the curve...

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1. Find an equation for the line in the xy?plane that is tangentto the curve at the point corresponding to the given value of t.Also, find the value of d^2y/dx^2 at this point. x=sec t, y=tan t,t=?/6

2. Find the length of the parametric curve: x=cos t, y=t+sin t,0 ? t ? ?. Hint:To integrate , use the identity,  andcomplete the integral.

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