Question

If A vector is equal to 4i-16j - 3 k and B vector is equal to - 2i -5j + 7 k find angle between the a vector and b vector

Answer 1

bro very easy !
now :-
a= 4i-16j- 3k
b= -2i-5j+7k
solving both we get:-

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Answer 2

I will tell you the method and skip the calculation part.

So as we know,

A.B = |A| x |B| x Cos β ( Where β is the angle )

Find dot product and divide by product of Magnitudes of the vectors to get cos β


Hope it helps.