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Q1  ;  cos1 x cos2 x cos3 x..........x cos90 x........x cos180

          cos1 x cos2 xcos3 x............x 0 x..........x cos180


hence proved.

Q2  ;   tan5 x tan25 x tan30 x tan65 x tan85
          tan5 x tan25 x tan30 x tan(90-25) x tan(90-5)
          1/cot5 x 1/cot25 x tan30 x cot25 x cot5
          1 x 1 x tan30
           tan30  or   1/root 3

0 0 0
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