15. d²y 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 at this point. 2 x=sec t₁y=cos t;t= Write the equation of the tangent line. y= (Type exact answers, using radicals as needed.) What is the value of dx I dx at this point? (Type an exact answer, using radicals as needed.) dx

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