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 dx x=t- sin t, y =1-2 cos t, t= w / 8 Write the equation of the tangent line. y = x + (Type exact answers, using it as needed.) What is the value of at this point? dx 2 dx 2 (Type an integer or a simplified fraction.)