alpha and beta are the angle made by a vector with positive x axis and possitive y axis respectively which set of alpha and beta not possible explain with reason a.60,40 b.45,60 c.60,45 d.30,45

vector

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  • Ans is (d) because as we know the square sum of direction cosines is 1.... Now from the options i am damn sure the vector is in 3d plane... Therefore gamma must be here.... Now in option d) square sum of these two angles cosines is 1 which is impossible as this vector not in xy plane because sum of angle is not 90.... Yani ki gammma angle yaha par hoga jiski uajah se square of cosines ka sum greater than 1 hoga....
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  • they will be either= or < 90° so ans is first cz total angle is more than 90°
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