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A) \[sun\,(A+B)=\frac{1}{5}\]
B) \[sun\,(A+B)=-\frac{1}{5}\]
C) \[Cos\,\,(A-B)=\frac{1}{5}\]
D) \[Cos\,\,(A+B)=-\frac{1}{5}\]
Correct Answer: D
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