Question: substituting an expr into another

i have the following command.

y := 23.45*sin((360*(x+284))/284):
seq('y'(x) = evalf(y), x = 1..365);

i want to calculate:

arccos(-tan(10)*tan(all the y(x) values))

how can i get maple to do this?

can anyone please help....

Judith

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