write difference between artery ,vein and capillaries
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Arteries carry oxygenated blood away from the heart. ... The capillaries then deliver the waste-rich blood to the veins for transport back to the lungs and heart. Veins carry the blood back to the heart. They're similar to arteries but not as strong or as thick.
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If angle mode by a vector = α₁ í + α ₂j +α₂ with x axis is lambda , with y axis is beta; with I z axis is gamma,then find out Cos²lamda + cos² beta + Cos² gama
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