dz 4. Let r - y – 23 = 6ryz, then the value of is dr %3D 22 + 2ry (d) 코- 2yz 2 + 2yz y? – 21z (c) 22 + 2ry 12 - 2yz (a) 22 + 2ry (b) y? + 2rz

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