If x+y directly proportional x-y then show that x^3+y^3 directly proportional xy(x+y)

Question

If x+y directly proportional x-y then show that x^3+y^3 directly proportional xy(x+y)​

Luna · Answer

Step-by-step explanation:   कॉलम ए    1. सियाल    2. सिमा    3. नाइफ़    4. बेसाल्ट्    5. ग्रेनाइट    कॉलम बी    (a) एक्सट्रसिव आग्मेय चट्टानें    (b) घुसपैठ आग्नेय चट्टानें    (c) मेटामॉर्फिक चट्टानें    (d) सिलिका और एलुमिना    (e) सिलिका और मैग्नीशियम    6. स्लेट और संगमरमर (f) निकल और फैरस

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