(-14)/[(x-5)²-2]≥0
-14<0⇒(x-5)²-2<0
(x-5-√2)(x-5+√2)<0
x=5+√2 U x=5-√2
x∈(5-√2;5+√2)
-9.6-x-2=0.8x-3.6
-9.6-2+3.6=x+0.8x
-8=1.8x
x=-8/1.8
Cos(4π+t)=cost=12/13
sint=-√(1-cos²t)=-√(1-144/169)=-√25/169=-5/13
(6|cost|-|sint|)/cost=(72/13-5/13):12/13=67/13*13/12=67/12=5 7/12
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