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1-cos^2x / 1+cos^2x =
cos^2x + sin^2x - cos^2x / cos^2x + sin^2x + cos^2x =
sin^2x / sin^2x + 2 cos^2x =
1/ 2cos^2x itu mungkin jawabannya gan
Maaf Kalo Salah Yah ^_^