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5.3.2: Векторний напрямок
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\ cos\ beta=\ фракція {\ vec {r}\ час {y}} {|\ vec {r} |} =\ frac {r_ {y}} {\ sqrt {r_ {x} ^ {2} +r_ {y} ^ {2} +r_ {y} ^ {2} +r_ {2} +r_ {z} 2}}}\\ cos\ бета=\ фракція {\ vec {r}\ раз\ шат {y}} {|\ ve...\ cos\ beta=\ фракція {\ vec {r}\ час {y}} {|\ vec {r} |} =\ frac {r_ {y}} {\ sqrt {r_ {x} ^ {2} +r_ {y} ^ {2} +r_ {y} ^ {2} +r_ {2} +r_ {z} 2}}}\\ cos\ бета=\ фракція {\ vec {r}\ раз\ шат {y}} {|\ vec {r} |} =\ frac {r_ {y}} {\ sqrt {r_ {x} ^ {2} +r_ {y} ^ {2} +r_ {z} ^ {2}}} =\ frac {-8.8}\ sqrt {(2.5) ^ {2} + (-8.8) ^ {2} + (4.