Mathematics

Mathematics

Problem

Let u⃗=(cos⁡25∘,sin⁡25∘)\vec{u}=(\cos25^{\circ},\sin25^{\circ}). Which of the following unit vectors makes an angle of 105∘105^{\circ} with u⃗\vec{u}? a) (cos⁡80∘,sin⁡80∘)(\cos80^{\circ},\sin80^{\circ}) b) (cos⁡105∘,sin⁡105∘)(\cos105^{\circ},\sin105^{\circ}) c) (cos⁡130∘,sin⁡130∘)(\cos130^{\circ},\sin130^{\circ}) d) (cos⁡155∘,sin⁡155∘)(\cos155^{\circ},\sin155^{\circ})

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