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sin2 A + sin4 A =1 বা, sin4 A = 1- sin2 A বা, sin4 A =cos2 A বা, sin4 A/cos4 A = cos2 A/ cos4 A বা, tan4 A = 1/cos2 A বা, tan4 A = sec2 A বা, tan4 A =1+ tan2 A বা, tan4 A - tan2 A = 1 ( proved)
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