Question #47e3f

1 Answer
P dilip_k
Dec 5, 2016

We know that -1<=costheta<=1−1≤cosθ≤1

when theta=(2n+1)pi,costheta=-1θ=(2n+1)π,cosθ=−1
and when theta=2npi,costheta=1θ=2nπ,cosθ=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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