Question

prove it....


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Answer 1

Answer:

2tan`¹1/5=tan`¹=tan`¹2×1/5/1-1/5

=tan`¹(2/5×25/24) =tan`¹5/12

left,

4tan`¹1/5-tan`¹1/70+tan`¹1/99

=2tan`¹1/5-tan`¹1/70+2tan`¹1/5+tan`¹1/99

=tan`¹5/12-tan`¹1/70+tan`¹5/12+tan`¹1/99

=tan`¹5/12-1/70/1+5/2×1/70+tan`¹5/12+1/99/1-5/12×1/99

=tan`¹(338/845) +tan`¹(507/1183)

=tan`¹2/5+tan`¹3/7

=tan`¹2/5+3/7/1-2/5×3/7

=tan`¹29/29

=tan`¹1

=π\4(proved)

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