Question

Tolong bantu no 20 dong kak

Answer 1

Verified answer

Jawab


cos1/2 a = √(x²-1) / (x)

sin²  1/2 a = 1 - cos² 1/2a
sin² 1/2 a = 1 - (x² -1) / x²
sin² 1/2 a  = (x² - x² + 1) /x²
sin²  1/2 a = 1/x²
sin 1/2 a = √(1/x²) = 1/x

sin a = 2 (sin 1/2 a)(cos 1/2 a)

sin a = 2 (1/x) { √(x² - 1) / x}
sin a = 2 √(x² -1) / (x²)

jawab C