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Q6 of 285 Page 409

Find , when:
x² + y² — 3xy = 1

Let us differentiate the whole equation w.r.t x

Formula :

According to chain rule of differentiation

According to product rule of differentiation

Therefore ,

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4

Find , when:

5

Find , when:

xy = c²

7

Find , when:

xy² — x²y — 5 = 0

8

Find , when:

(x² + y²)² = xy