Respuesta :

sweetyhere

Answer:

cos theta1=3/8

draw a triangle

l\

l \. 8

z l \

l__✓\

3

(sry for the inaporopriate fig)

tick mark represents theta here

cos is adjacent/hypotenuese

sin is opposite /hypotenuese

let unknown side be z

z²=64-9

z²=55

z=√55

sintheta =√55/8