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• (tan^2)/(sec^2) = sin^2
• (sin^2/cos^2)/(1/cos^2) = sin^2
• (sin ^2 × cos^2)/(cos^2) = sin^2
• sin^2 a = sin^2 a #terbukti
note :
• 1 + tan^2 x = sec^2 x
~ tan^2 x = sec^2 x -1
• ^ = pangkat
~ 2^2 = dua 'pangkat' dua
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