Suppose sin(x + y) = 4x – 4y . (a) Implicitly differentiate both sides of the equation above (enter y' for the derivative of y): (b) Solve for y' to get y' = (c) The slope of the tangent line at the point (π, π) is (d) The equation of the tangent line at the point (π, π) is y = (Hint: First write the point-slope form.)

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