Find (9x²+1/9x²) if (3x-1/3x)=20
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Answer:
(3x-1/3x)=20
squaring both sides
(3x-1/3x)²= (20) ²
9x²+1/9x²-2(3x) (1/3x) = 400
9x²+1/9x² -2 = 400
9x²+1/9x² = 400+2
9x²+1/9x² = 402
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