Evaluate
16x^{4}-43046721y^{4}
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16x^{4}-43046721y^{4}
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16x^{4}-81^{4}y^{4}
Expand \left(81y\right)^{4}.
16x^{4}-43046721y^{4}
Calculate 81 to the power of 4 and get 43046721.
16x^{4}-81^{4}y^{4}
Expand \left(81y\right)^{4}.
16x^{4}-43046721y^{4}
Calculate 81 to the power of 4 and get 43046721.
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