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\begin{array}{l}{\cos 225^{0}+\sin 165^{\circ}=} \\ {\text { 1) } 0 \quad 2 ) \frac{\sqrt{3}-1}{\sqrt{3}} 3 ) \frac{\sqrt{3}-1}{2 \sqrt{2}} 4 ) \frac{\sqrt{2}+1}{\sqrt{2}}}\end{array} |
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Answer» the answer is not in the option. |
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