a) Find the equation of the tangent line to the curve + + 2xy - y' + x - 2 at the point (1, 2) b) Find the equation of the tangent line to the graph of y = V10+x3 at a point with x =-1 4) A revolving light located 4 km from a straight shoreline, turns at constant angular speed of 5 rad/min. With what speed is the spot of light moving along the shoreline when the beam makes an angle of 30 degree with the shoreline