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Answer 1 · 2018-02-03T23:08:56

#(1+cos240)/(1+cos240)=1#

Substitute #u=1+cos240#

#u/u#, Since any number Divided by Itself is #1#

The awnser Is #1# so,

#(1+cos240)/(1+cos240)=1#

Answer 2 · 2018-02-04T01:08:31

#1#

#(1+cos240)/(1+cos240)#

If the top and bottom numbers of the fraction are equal, then the fraction is equal to #1#.

#:.=1#