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Sec²A - sin²A - 2sin⁴A / 2cos⁴A- cos²A = 1.prove it...please answer my question . |
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Answer» Sin²A + Cos²A = 1 Step-by-step EXPLANATION: = Sec²A - {Sin²A(Cos2A)/Cos²A(Cos2A) } { Cos2A = (2Cos²A - 1) = (1 - 2Sin²A) } = Sec²A - (Sin²A/Cos²A) = Sec²A - tan²A = 1 + tan²A - tan²A = Hence PROOF |
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