tolong bantu saya mengerjakan soal limit trigonometri

Limit Trigonometri

limit (x-> π/2)  (1 - sin 2x)/ ( cos² 2x)=

substitusikan x = π/2
= (1 - sin 2(π/2)) / (cos 2(π/2))²
= (1 - sin π)/ (cos π)²
= (1 - 0) / ( -1)²
= 1/1
= 1