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Question #47e3f

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Dec 5, 2016

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#

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