SOLUTION: Hi! How could I solve without using a calculator: csc(-9Π/4) = ? Thanks!

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Question 1089973: Hi!
How could I solve without using a calculator:
csc(-9Π/4) = ?
Thanks!
Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
,,, all have a period of so,

So,

Since,

Then,

So,
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