Tolong bantu jawab ya Kaka soal nomor 4 dan 5 beserta caranya terimakasih :)

4. a = √17^-8^
a = √289-64
a = √225
a = 15
sin = 15/18
cos= 8/18=4/9
tan = 15/8

5. cos 30° = x/6
√3/2 = x/6
x√3 = 12
x = 6√3 (panjang NL)

sin 45° = y/6√3
√2/2 = y√3/18
y√5 = 36
y = 36√5/5 (panjang kl)