Use a half-angle identity to find the exact value for csc 112.5◦?
Use a half-angle identity to find the exact value for csc 112.5◦
[please show how you worked out the problem]
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Use a half-angle identity to find the exact value for csc 112.5◦
[please show how you worked out the problem]
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Verified answer
csc 112.5◦ = 1 / sin 112.5◦
sin(2x) = 2 sin(x) cos(x) [ half-angle formula]
= 1 / 2 sin (56.25) cos(56.25)
You can use the tables to find them.
It is not possible to express 56.25 using PI, so I don't see how you can find the exact value.
180-112.5
=67.5
180-0-112.5=067.5..
i think so...
i'm not sure