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If b+c=pi, prove that 2(1-sinb sinc)= cos^2b+cos^2c.

Quote: Originally Posted by Tiger If b+c=pi, prove that 2(1-sinb sinc)= cos^2b+cos^2c. Hi all http://i99.servimg.com/u/f99/12/89/99/77/almonk23.gif