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Ok so for question 9 i got this

a:0 show swimming distance is given by relationd d=wsecx

cos x=w/d

d=w/cosx

d=wsecx

B

if l=2w determine the range of values that x may take on given that P can anywhere along the length of pool. so i tried these

cosx=w/d will not work

sinx=2w/d will not work

tanx=2w/w

tanx=2 inverse therefore

0<x<1.07, is this right?

C) im stuck in this question! please help any hints?

D) I think i know how to do once i figured out c?

E) same as D

For question 10, im just confused any hints is appreciated