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
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