If x= 2 and y = 1, find the value of x⁴+y⁴ - 2 x²y²
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x⁴ + y⁴ - 2x²y²
= (x²)² + (y²)² - 2 * x² * y²
= ( x² - y² )²
Now putting the value of x = 2 and y = 1 ,
= ( 2² - 1² )²
= ( 4 - 1 )²
= 3²
= 9
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