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```        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

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
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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