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The value of ​θ lying between -​π/4 & π/2 and 0​≤A≤π/2​ and satisfying the equation | 1+sin2A                cos2A                   2sin4​θ   |
                                                                                                     | sin2A       1+cos2A          2sin4θ  | = 0 
                                                                                                     | sin2A            cos2A       1+2sin4θ|

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