If $sin17^{0}$ = $\frac{x}{y}$, then $sec 17^{0} - sin 73^{0}$ is equal to

If $sin17^{0}$ = $\frac{x}{y}$, then $sec 17^{0} - sin 73^{0}$ is equal to
1). $\frac{y}{(\sqrt{y^{2}-x^{2}})}$
2). $\frac{y^{2}}{(x\sqrt{y^{2}-x^{2}})}$
3). $\frac{x}{(y\sqrt{y^{2}-x^{2}})}$
4). $\frac{x^{2}}{(y\sqrt{y^{2}-x^{2}})}$

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