Tolong dong nomor 1&2 sama caranya makasih

1) sin A / cos A = tan A
(2/√5)/(1/√5) = 2/1
(2/√5)×(√5/1) =
2/1 = tan A
2) (sin A)^2 + (cos A)^2 = 1
(2/√5)^2 + (1/√5}= 1
(4/5)+(1/5) =
5/5 = 1