1.

The sine of the angle between the two values a = 3i + j + k and b = 2i – 2j + k is

A. \(\sqrt {\frac{{74}}{{99}}} \)
B. \(\sqrt {\frac{{25}}{{99}}}\)
C. \(\sqrt {\frac{{37}}{{99}}}\)
D. \(\frac{{\sqrt 5 }}{{51}}\)
Answer» B. \(\sqrt {\frac{{25}}{{99}}}\)


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