Question

Question #47e3f

Answer 1

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`