21. Himpunan penyelesaian persamaan 1- sin2x = 0 untuk 0 ≤ x≤ 2π adalah ...
A. {π/2 , 3π/2}
B. {π/4 , π/2}
C. {π/2 , 5π/2}
D. {π/4 , 5π/4}
E. {π/4 , π/2 , 5π/4, 3π/2}B. {π/4 , π/2}
C. {π/2 , 5π/2}
D. {π/4 , 5π/4}
Jawaban : D
1- sin2x = 0
1 = sin2x
sin π/2 = sin2x
π/2 = 2x
x = π/4
sin 5/2π = sin 2x
5/2π = 2x
x = 5π/4
{π/4 , 5π/4}
Soal 22
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