Answers

2015-06-13T05:09:16+05:30
Tan2Ф=cot(Ф+6)
we know that tan2Ф=cot(90-2Ф)
so cot(90-2Ф)=cot(Ф+6)
90-6=Ф+2Ф
84=3Ф
⇔Ф=28
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