1. The value of $$\frac{sin39^{\circ}}{cos51^{\circ}}$$ + $$2 tan11^{\circ} tan31^{\circ} tan45^{\circ} tan59^{\circ} tan79^{\circ}$$ - $$3(sin^{2}21^{\circ} + sin^{2}69^{\circ})$$ is
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