If $\\sin\\theta = \\sqrt{\\frac{2}{5}}$ and $\\theta$ is an obtuse angle, find $\\cos\\theta$.
University of Ilorin MTH101 ester past question
- $-\\sqrt{\\frac{3}{5}}$
- $\\sqrt{\\frac{3}{5}}$
- $-\\frac{\\sqrt{3}}{5}$
- $\\frac{\\sqrt{3}}{5}$
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