Qualification > Math

C3 and C4 DOUBTS HERE!!!

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WARRIOR:
The angle between the vectors i + 3j and j + xk is 60
Show that x = square root of (13/5)

i get squarte root of (26/10 )

can someone show me the right working?

astarmathsandphysics:
you got the right answer.
Cancel it down
LAUGH AT YOURSELF

~ Miss Relina ~:
how to differentiate this one  :-[

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