if 900 = x² × y² × z², find value of x,y,z
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4. If y = (sin-¹ x)², prove that (1-x²)y² - xy₁ - 2 = 0 and deduce that (1-x²) Yn+2 - (2n + 1)xYn+1 -n₂yn = 0.
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