-1+sec²30° jawaban dan caranya

t r i g o n o m e t r i

-1 + sec² 30°

sec² 30°
= (sec 30)²
sec 30
= 1/cos 30
= 1/(√3)/2)
= 2/√3

sec²30
= 4/3

-1 + 4/3
= 4/3 - 3/3
= ⅓