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- In Exercises 19–22, find an equation of the tangent line to the curve at each given point.What would the equation of the tangent plane at that point be?In Exercises 5–10, find an equation for the tangent line to the curve at the given point. Then sketch the curve and tangent line together. 5. y = 4 - x2, (-1, 3) 6. y = (x - 1)2 + 1, (1, 1) 7. y = sqrt(2x), (1, 2) 8. y = 1/x2 , (-1, 1) 9. y = x3, (-2, -8) 10. y=1/x3 , (-2, -1/8).