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kalikan dengan 1 - sinθ / 1 - sinθ
√((1 - sinΘ / 1 + sinΘ) * (1 - sinΘ - 1 - sinΘ))
√(( 1 - 2sinΘ + sin²Θ) / (1 - sin²Θ))
√ (1 - 2sinΘ + sin²Θ) / cos²Θ
√(1 / cos²Θ) - (2sinΘ / cos²Θ) + (sin²Θ / cos²Θ)
√(sec²Θ - 2tanΘsecΘ + tan²Θ)
Jadikan bentuk pemfaktoran
√(secΘ - tanΘ)²
= secΘ - tanΘ
terbukti.