$$\frac{\sin\ 45^{\circ}.\tan^{2}60^{\circ}}{\cos\ 45^{\circ}}$$
$\frac{3535533905932743\sqrt{2}}{5000000000000000}\approx 1$
$$\frac{0.7071067811865486}{\cos(45)}$$
$$\frac{0.7071067811865486}{\frac{\sqrt{2}}{2}}$$
$$\frac{0.7071067811865486\times 2}{\sqrt{2}}$$
$$\frac{0.7071067811865486\times 2\sqrt{2}}{\left(\sqrt{2}\right)^{2}}$$
$$\frac{0.7071067811865486\times 2\sqrt{2}}{2}$$
$$\frac{1.4142135623730972\sqrt{2}}{2}$$
$$0.7071067811865486\sqrt{2}$$
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