Mathematics Vector Algebra Scalar and Vector Product

If the angle between \(\overrightarrow{\mathrm{a}}=2 y^2 \hat{i}+4 y \hat{j}+\hat{\mathrm{k}}\) and \(\overrightarrow{\mathrm{b}}=7 \hat{i}-2 \hat{j}+y \hat{\mathrm{k}}\) is obtuse, then:

1
\(-\frac{1}{2}
2
\(-1
3
\(\frac{1}{2}
4
\(0

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