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1. (a) Let usin-¹ x+y √x + √y 8² u prove that 20u + 2xy- მე2 əxəy 0²u მყ2 +y² sin u cos 2u 4 cos³ u
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1. (a) Let usin-¹ x+y √x + √y 8² u prove that 20u + 2xy- მე2 əxəy 0²u მყ2 +y² sin u cos 2u 4 cos³ u
1. (a) Let usin-¹ x+y √x + √y 8² u prove that 20u + 2xy- მე2 əxəy 0²u მყ2 +y² sin u cos 2u 4 cos³ u