HARD
JEE Main
IMPORTANT
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In a regular hexagon ABCDEFAB+AC+AD+AE+AF=kAD, where k is equal to

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Important Questions on Introduction to Vectors

MEDIUM
JEE Main
IMPORTANT
If a+b+c=0 and a=3, b=5 and c=7, then the angle between a and b is
HARD
JEE Main
IMPORTANT
If the sum of two unit vectors is a unit vector, then the magnitude of their difference is
EASY
JEE Main
IMPORTANT

The position vectors of the points A, B, and C are i^+2j^k^i^+j^+k^ and 2i^+3j^+2k^, respectively. If A is chosen as the origin, then the position vectors of B and C are

MEDIUM
JEE Main
IMPORTANT
The orthocentre of an equilateral triangle ABC is the origin O. If OA=a, OB=b and OC=c, then AB+2BC+3CA is equal to
MEDIUM
JEE Main
IMPORTANT
If the position vectors of P and Q are i^+2j^7k^ and 5i^3j^+4k^, respectively, then the cosine of the angle between PQ and z-axis is
EASY
JEE Main
IMPORTANT
The non-zero vectors a, b and c are related by a=8b and c=-7b, the angle between a and c is
EASY
JEE Main
IMPORTANT
The unit vector bisecting OY (representing Y-axis) and OZ (representing Z- axis) is
MEDIUM
JEE Main
IMPORTANT
A unit tangent vector at t=2 on the curve x=t2+2, y=4t-5 and z=2t26t is