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Answer 1 · 2016-06-30T15:29:47

If the question is as follows

#(cos(-60)-tan(135))/(tan315+cos660)#

#=(cos60-tan(2*90-45))/(tan(4*90-45)+cos(8*90-60))#

#=(cos60-(-tan45))/(-tan45+cos60)#

#=(1/2-(-1))/(-1+1/2)#

#=(3/2)/(1/2)=3/2xx2/1=3#

Otherwise
if the question is as follows

#cos(-60)-tan135/tan315+cos660#

#=cos60-(tan(2*90-45))/(tan(4*90-45))+cos(8*90-60)#

#=cos60-(-tan45)/(-tan45)+cos60#

#=1/2-1+1/2=0#