$${ 3 }^{ 2 } 59-8 { y }^{ 2 } 484$$
$531-3872y^{2}$
$$9\times 59-8y^{2}\times 484$$
$$531-8y^{2}\times 484$$
$$531-3872y^{2}$$
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$-7744y$
$$\frac{\mathrm{d}}{\mathrm{d}y}(9\times 59-8y^{2}\times 484)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(531-8y^{2}\times 484)$$
$$\frac{\mathrm{d}}{\mathrm{d}y}(531-3872y^{2})$$
$$2\left(-3872\right)y^{2-1}$$
$$-7744y^{2-1}$$
$$-7744y^{1}$$
$$-7744y$$
