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Answer 1 · 2016-12-05T01:31:40

We know that #-1<=costheta<=1#

when #theta=(2n+1)pi,costheta=-1#
and when #theta=2npi,costheta=1#
#" where "n in ZZ#

So maximum value of #cos(5x)=1# and minimum value of #cos(5x)=-1#

Hence

#Y_"max"=10*1-1=9#

#Y_"min"=10*(-1)-1=-11#