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D Question 1 Find the partial derivative f. for the function f(x)=x²-8y² +5. O f. (x,y) - 32x O f. (x,y) = 2x Of(x,y) - 9x Of(x,y) - 17x Of(x,y) - 16x Question 2 az Find the partial derivative for the function - 30²√√x. 2- 0-15y²√x 01-15y2 ○ O 30 W əx √√x əx X 15y² əx√√x.

Question 3 Find the partial derivative for the function == O O - 12x¹¹ cos(x¹²+¹2) əx Ⓒ3-12x¹3 cos(x¹3+y¹3) Ⓒ-12x¹3 sin(x¹3+y13) --12x¹¹ sin(x¹²+¹²) --12x¹3 sin Question 4 O 816 Find the partial derivative - cos(x¹2 +12). - 3y¹ sm (x² + y²) --3y² sin(x² + y²) --3* sin(x² + y²³) -3y² cos(x² + y²) - 3y* cos(x² + y²) for the function - cos(x+y³).