Trigonometric series.
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trigonometry.......
mohit Sun Jul 17, 2011 1:25 pm
=sin^2 (3.14/2-4*3.14/9)+sin^2 (3.14/9)+ 1/4 +sin^2 (2*3.14/9)+sin^2 (3.14/2-2*3.14/9)+3/4 +sin^2 (3.14/2-3.14/9)+sin^2 (4*3.14/9)+1;
=cos^2(4*3.14/9)+sin^2 (3.14/9)+sin^2 (2*3.14/9)+cos^2 (2*3.14/9)+cos^2 (3.14/9)+sin^2 (4*3.14/9)+1+1;
=3+2;
=5
Hence proved.....
=cos^2(4*3.14/9)+sin^2 (3.14/9)+sin^2 (2*3.14/9)+cos^2 (2*3.14/9)+cos^2 (3.14/9)+sin^2 (4*3.14/9)+1+1;
=3+2;
=5
Hence proved.....
mohit- Guest
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