Question

if the resultant of the vector 3 ICAP + 4 j cap + 5 k cap and five I cap + 3 J cap + 4 k cap make an angle theta with x-axis then find cos theta

Answer 1

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Answer 2

Explanation:

first we will find the resultant and then the magnitude of the resultant and magnitude of the vector a and vector b after that we will put this value in equation 1