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cos45 grade+cos135 grade


Răspuns :

Salut,

cos45°+cos135° = ?

cos135° = cos(180°-45°) = cos180°•cos45°+sin180°•sin45° = -1•√2/2+0•√2/2 = -√2/2.

√2/2+(-√2/2) = √2/2-√2/2 = 0.



Succes! :3
cos45 grade =(radical2) /2
cos135 grade =cos(90+45)grade= -cos45 grade
cos45 grade - cos 45grade = 0
Deci totul este egal cu 0.