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Let O be the origin and OX, OY, OZ be th...

Let O be the origin and OX, OY, OZ be three unit vectors in the directions of the sides, QP, RP, QR respectively of a `trianglePQR`.
Q. If the triangle PQR varies, then the minimum value of `cos(P+Q)+cos(Q+R)+cos(R+P)` is

A

`(-3)/(2)`

B

`(3)/(2)`

C

`(5)/(3)`

D

`(-5)/(3)`

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A
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ARIHANT MATHS-PRODUCT OF VECTORS-Exercise (Questions Asked In Previous 13 Years Exam)
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  3. Let O be the origin, and O X , O Y , O Z be three unit vectors ...

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  5. Let vec(a) , vec(b) and vec(c) be three non-zero vectors such that no ...

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  6. If a, b and c are unit vectors satisfying |a-b|^(2)+|b-c|^(2)+|c-a|^(2...

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  7. The vector(s) which is/are coplanar with vectors hat(i)+hat(j)+2hat(k)...

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  8. Let vec a =hat i+hat j+hat k,vec b=hat i -hat j+hat k and vec c =hat ...

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  9. Two adjacent sides of a parallelogram ABCD are given by vec(AB)=2hati+...

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  10. Let P, Q, R and S be the points on the plane with position vectors -2h...

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  11. If a and b are vectors in space given by a=(hat(i)-2hat(j))/(sqrt(5)) ...

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  12. If veca,vecb,vecc and vecd are unit vectors such that (vecaxxvecb)*(...

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  13. The edges of a parallelopiped are of unit length and are parallel to ...

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  14. Lelt two non collinear unit vectors hata and hatb form and acute angle...

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  15. Let the vectors PQ, QR, RS, ST, TU and UP represent the sides of a reg...

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  16. The number of distinct real values of lambda, for which the vectors -l...

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  17. Let veca,vecb,vecc be unit vectors such that veca+vecb+vecc=vec0. Whic...

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  18. Let A be vector parallel to line of intersection of planes P1 and P2. ...

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  19. Let a=hat(i)+2hat(j)+hat(k), b=hat(i)-hat(j)+hat(k), c=hat(i)+hat(j)-h...

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  20. If vec a , vec b and vec c are three non-zero, non coplanar vecto...

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