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= (1 - √3)/(1 + √3) + (1 + √3)/(1 - √3)
samakan penyebutnya menjadi (1 + √3)(1 - √3)
= (1 - √3)(1 - √3)/(1 + √3)(1 - √3) + (1 + √3)(1 + √3)/(1 + √3)(1 - √3)
= [(1 - √3)² + (1 + √3)²] / (1 + √3)(1 - √3)
ingat bahwa (a + b)(a - b) = a² - b² sehingga (1 + √3)(1 - √3) = 1 - 3 = -2
= [(1 - 2√3 + 3) + (1 + 2√3 + 3)]/-2
= (1 - 2√3 + 3 + 1 + 2√3 + 3)/-2
= 8/-2
= -4 (D)