9. Find an equation of the tangent line to the curve x³ + y3 = 9 at the point (1.2). Solution:.. dx dy dx (x³ + y³) = 10. Given x sin y + y cos x = 1, find Solution: Solution: -(x sin y) = dx -(y cos x) = At point (1, 2) dy dx Final Answer: An equation of the tangent line use y-y₁ = m(x-x₂). -(1) Final Answer: dx 11

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