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(sin m cos m x 1/ cos² m ) / [ (2cos² m - 2 sin² m²) / cos² m ] [ atas bawah dibagi cos²]
sin m /cos m / [ 2 - 2 sin² m /cos² m ] =
tg m / [ 2 ( 1 - tg² m ] [ sin / cos = tg ] jawaban A