1.

find the value of:( 1+ cos(pi/8))(1+ cos(3pi/8))(1+ cos(5pi/8))(1+ cos(7pi/8)) = ?

Answer» find the value of:
( 1+ cos(pi/8))(1+ cos(3pi/8))(1+ cos(5pi/8))(1+ cos(7pi/8)) = ?


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