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CBSE Class 11-science Answered

Find the cosine angle between vector 4i + 3j + k and 2i- j+2k.Find the cosine angle between vector 4i + 3j + k and 2i- j+2k.

Asked by deepakprakash.vaishnav3 | 01 Aug, 2020, 11:16: AM
Expert Answer
A with rightwards arrow on top equals 4 i plus 3 j plus k space a n d space B with rightwards arrow on top equals 2 i minus j plus 2 k

A with rightwards arrow on top B with rightwards arrow on top equals A B C o s theta
open parentheses 4 i plus 3 j plus k close parentheses open parentheses 2 i minus j plus 2 k close parentheses equals square root of 4 squared plus 3 squared plus 1 squared end root cross times square root of 2 squared plus 1 squared plus 2 squared end root thin space C o s theta
7 equals square root of 26 cross times 3 C o s theta
C o s theta equals fraction numerator 7 over denominator 3 square root of 26 end fraction
Answered by Utkarsh Lokhande | 01 Aug, 2020, 01:52: PM
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