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Verified answer
Sin ¢ dikuadran IV bernilai negatifsin² ¢ + cos² ¢ = 1
sin² ¢ + (1/a)² = 1
sin² ¢ = 1 - 1/a²
sin² ¢ = (a² - 1)/a²
sin ¢ = ± √((a² - 1)/a²)
sin ¢ = - √(a² - 1) / a