If $sec (3x - 20^{0})$ = $cosec (3y + 20^{0})$, then what is the value of tan (x + y)?

If $sec (3x - 20^{0})$ = $cosec (3y + 20^{0})$, then what is the value of tan (x + y)?
1). 1
2). $\sqrt{3}$
3). $\frac{1}{\sqrt{3}}$
4). $\frac{2}{\sqrt{3}}$

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