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Q.

If   A→=B→+C→, and the magnitudes of  A→,B→,C→ are 5, 4, and 3 units, then angle between A→  and C→  is

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a

sin−1(34)

b

cos−1(35)

c

π2

d

cos−1(45)

answer is A.

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Detailed Solution

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cosθ=CA=35 or θ=cos−1(35). as shown in figure

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