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. x = 6 cost, y = 6 sint, t= -- 4 The equation represents the line tangent to the curve at t= - (Type an exact answer, using radicals as needed.) The value of - att= is dx (Type an exact answer, using radicals as needed.) Identify the symmetries of the curve r= 9 + 9cosl). Then sketch the curve. Is the curve symmetric about the x-axis? (:3 Yes [:1 No Is the curve symmetric about the y-axis'u' ("J No [:1 Yes Is the curve symmetric about the origin? (:3 Yes [:1 No Choose the correct graph below [:1 A. [:1 El. [:1 Cr [:1 D. 18 -18 18