buktikan bahwa sec²a + cosec²a = sec²a . cosec²a tolong bantu

Misal: a = 30°

sec^2 30° + cosec^2 30° = sec^2 30° × cosec^2 30°
(2/3√3)^2 + (2)^2 = (2/3√3)^2 × (2)^2
4/3 + 4 = 4/3 × 4
4/3 + 12/3 = 4/3 × 4
16/3 = 16/3