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veca and vecb are two vectors such that ...

`veca` and `vecb` are two vectors such that `|veca+vecb|= |veca-vecb|` then angle between `veca` and `vecb` is

A

`30^@`

B

`60^@`

C

`90^@`

D

`120^@`

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UNITED BOOK HOUSE-HIGHER SECONDARY EXAMINATION 2020.-EXERCISE
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  7. Evaluate : sec^2(tan^(-1)2)+cosec^2(cot^(-1)3).

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  13. Evaluate: int((cosx+xsinx)/(x(x+cosx)))dx.

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  14. If f(x) = -f(-x) then show that overset(a)underset(-a)int f(x)dx =0.

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  15. Find a vector of magnitude 14 in the direction of the vector -3hat i+6...

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  16. Find the direction cosines of a straight line which is situate on yz-p...

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  17. If P(A)=1/4,P(B)=1/3 and P(A-B)=1/6 then verify whether a and B are tw...

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  18. The mean and variance of a binomial distribution B(n,p|) are 4 and 3.2...

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  19. *' is an operation defined on Z set of all integers as a*b = a+b-2 for...

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