Bantu yok kak bentuk 1/1 + sini A sama dengan​

Identitas Trigonometri

1/(1 + sin A)

= 1/(1 + sin A) . (1 – sin A)/(1 – sin A)

= (1 – sin A) /! (1 – sin² A)

= (1 – sin A) / cos² A

= 1/cos² A – sin A/cos² A

= sec² A – (sin A/cos A)(1/cos A)

= sec² A – tan A sec A