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    				| 1. | 
                                    The value of (sin 39^(@))/(cos 51^(@)) + 2 tan 11^(@) tan 31^(@) tan 45^(@) tan 59^(@) tan 79^(@) - 3 (sin^(2) 21 ^(@) + sin^(2) 69^(@)) is | 
                            
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