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Sagot :
Step-by-step explanation:
tan 45= y/9
1=y/9
cross multiply
y= 9
sin 45=y/x
but y= 9
sin 45 = 9/x
0.7071=9/x
cross multiply
0.7071x= 9
x= 9/0.7071
x= 9√2
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