if u hv tym.. may try k. c. sinha

I want to know abt askiitians. This online coaching is very new to me. Is this site genuine ? For how much time, approximately they are working ? Frankly, we fear being cheated after investing.

If they exist , how is their service ? Because I find that a lot of ppl dont kw nything abt them.

I had attented one demo class, found it good. So shall I join them ?

Please give me your suggestions.. n tell me abt ur views..

but isnt the magnitude of

(A-B) = root( A square + B square + 2AB cos 60 ) ,   will be btween and , WHICH IS 180 -120= 60

 

             = root ( A square + B square +AB )



AND as C = root ( A square + B square - AB )

C < (A-B)



am i wrong ?

Vectors



Q. Let the angle between two nonzero vectors A and B be 120° and its resultant be C.



a) C must be equal to

b) C must be less than

c) C must be greater than

d) C may be equal to



the answer in the book is (c)... is that correct ? n show me the initial steps ....pls..