cosα=→m*→n/(ImI*InI)
→m*→n=-4*5+3*12=16
ImI=√(16+9)=5
InI=√(144+25)=13
cosα=16/(5*13)=16/65
2. -4/2=3/x⇒x=-1.5
3. 5*2+12x=0⇒x=-10/12=-5/6
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cosα=→m*→n/(ImI*InI)
→m*→n=-4*5+3*12=16
ImI=√(16+9)=5
InI=√(144+25)=13
cosα=16/(5*13)=16/65
2. -4/2=3/x⇒x=-1.5
3. 5*2+12x=0⇒x=-10/12=-5/6