Tunjukkan bahwa sin² x + cos² x = 1 berlaku untuk sudut - sudut berikut ! x = 300°

x = 300°
sin^2x + cos^2x = 1
substitusi nilai x =300°
sin^2(300°) + cos^2(300°) = 1
((1/2)√3)^2 + (1/2)^2 = 1
3/4 + 1/4 = 1
1 =1 (terbukti)

Bab Trigonometri
Matematika SMA Kelas X

sin² x + cos² x = 1 

x = 300°

sin² 300° + cos² 300° = 1
(-1/2 √3)² + (1/2)² = 1
3/4 + 1/4 = 1
4/4 = 1
1 = 1