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1.- Find the complementary angle to 47.6°
x = 90 - 47.6
x = 42.4°
2.- Use trigonometric functions to find the length
cos 42.4 = y/3900
-solve for y
y = 3900*cos42.4
y = 3900* 0.738
y = 2879.9 meters This is the result
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