cot -1(tan π/7) ?????
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cot-1x+tan-1x=π2⇒
cot-1tanπ7=π2-tan-1tanπ7
since,
tan-1tanx=x⇒
π2-π7=
7π-2π14=
5π14
cot-1tanπ7=π2-tan-1tanπ7
since,
tan-1tanx=x⇒
π2-π7=
7π-2π14=
5π14
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