sandraranger
23.08.2019 •
Mathematics
110
110. cos(5 + x) + cos(5 – 1) = cos x
el
cos
x
+ cost
x
= cos x
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Ответ:
∆ABC=∆ADE by AA test of similarity
CAB=EABCOMMON ANGLE
CBA=EDAEACH 90°
AB/AD =CB/EDCSST
9/6=3/x
3/2=3/x
x=2 x 3/3
x=2