A) \[Sin\text{ }\theta -cos\text{ }\theta =0\]
B) \[Sin\text{ }\theta +cos\text{ }\theta =0\]
C) \[\theta =45{}^\circ \]
D) \[Sin\text{ }2\theta =2\text{ }cos\left( \theta +15 \right)\]
E) None of these
Correct Answer: B
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