Sprendimas: DqALZ8 - 1

cos(α) =

( x1* x2+ y1* y2)

/ ( saknis(

x1^²+ y1^²)* saknis(

x2^²+ y2^²))

cos(α) =

( x1* x2+ y1* y2)

/ ( saknis(

x1^²+ y1^²)* saknis(

x2^²+ y2^²))

$cos(\alpha)$ = $\frac{x1\cdot x2+y1\cdot y2}{\sqrt {x1^{2}+y1^{2}}\cdot \sqrt {x2^{2}+y2^{2}}}$

cos(α) =

x1* x2

/ saknis(

x1^²+ y1^²)/ saknis(

x2^²+ y2^²)

y1* y2

/ saknis(

x1^²+ y1^²)/ saknis(

x2^²+ y2^²)

$cos(\alpha)$ = $\frac{x1\cdot x2}{\sqrt {x1^{2}+y1^{2}}\cdot \sqrt {x2^{2}+y2^{2}}}+\frac{y1\cdot y2}{\sqrt {x1^{2}+y1^{2}}\cdot \sqrt {x2^{2}+y2^{2}}}$

α = arccos((

x1* x2

/ saknis(

x1^²+ y1^²)/ saknis(

x2^²+ y2^²)

y1* y2

/ saknis(

x1^²+ y1^²)/ saknis(

x2^²+ y2^²)

)) $\alpha$ = $arccos((\frac{x1\cdot x2}{\sqrt {x1^{2}+y1^{2}}\cdot \sqrt {x2^{2}+y2^{2}}}+\frac{y1\cdot y2}{\sqrt {x1^{2}+y1^{2}}\cdot \sqrt {x2^{2}+y2^{2}}}))$

α = arccos(

x1* x2

/ saknis(

x1^²+ y1^²)/ saknis(

x2^²+ y2^²)

y1* y2

/ saknis(

x1^²+ y1^²)/ saknis(

x2^²+ y2^²)

) $\alpha$ = $arccos(\frac{x1\cdot x2}{\sqrt {x1^{2}+y1^{2}}\cdot \sqrt {x2^{2}+y2^{2}}}+\frac{y1\cdot y2}{\sqrt {x1^{2}+y1^{2}}\cdot \sqrt {x2^{2}+y2^{2}}})$