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Anand Rananaware Grade: 11
        1]If A = B+C and the magnitude of A, B and C are 5,4,3 unit, the angle between A and B is :


(a)cos-13/5 (b) cos-14/5

(c)p/2 (d) sin-1 3/5
6 years ago

Answers : (2)

saumya shivhare
33 Points
										

tan x= c sino/(b+ c coso)


on solving we get x= cos-1 4/5 or sin-1 3/5

6 years ago
vikas askiitian expert
510 Points
										

A = B+C 


A-B = C , now squaring both sides


(A-B)2 = C2


 A2+B2-2(A.B) = C2


    (A.B) = (25+16-9)/2 = 32/2                                (A.B(A dot B) = ABCOS@)


    ABCOS@ = 16


       COS@ = 4/5


     SIN@ = 3/5 OR @ = SIN-3/5


OPTION D) IS CORRECT


approve my ans if u like it

6 years ago
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