TOLONG BANTU DONG MAT KLS 10

Mapel : Matematika
Kelas : X SMA
Bab : Trigonometri

Pembahasan :
Sin² 30° + Cos² 60° - 2 Sin 90
= (Sin 30)² + (Cos 60)² - 2 (Sin 90)
= (1/2)² + (1/2)² - 2(1)
= 1/4 + (1/4) - 2
= (1 + 1 - 8)/4
= -6/4
= -3/2