SOLUTION: Use half number identity to find tan (-pi/8) I get that its a 45 degree so 1- cos45/ 1sin45 and i did 1 - (square root 2/2) / -(-square root 2/2) I tried

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Question 959221: Use half number identity to find tan (-pi/8)
I get that its a 45 degree so 1- cos45/ 1sin45
and i did 1 - (square root 2/2) / -(-square root 2/2)
I tried - square root 2 -1 and that was wrong
I tried square root 2 +1 and thats wrong
Is it supposed to be 1 + square root of 2?
Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website!
Use half number identity to find tan (-pi/8)
I get that its a 45 degree so 1- cos45/ 1sin45
and i did 1 - (square root 2/2) / -(-square root 2/2)
I tried - square root 2 -1 and that was wrong
I tried square root 2 +1 and thats wrong
Is it supposed to be 1 + square root of 2?
========================
Is it supposed to be 1 + square root of 2?
Is that the answer?
Use a calculator to check it.
tan(-pi/8) =~ -0.414213562
= -sqrt(2) + 1
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Half-angle formulas are well covered on Wikipedia.

SOLUTION: Use half number identity to find tan (-pi/8) I get that its a 45 degree so 1- cos45/ 1sin45 and i did 1 - (square root 2/2) / -(-square root 2/2) I tried - square root 2 -1 and