Posted by briana on Sunday, January 2, 2011 at 4:58pm.
Use the following identities to express everything in sin(x), cos(x), tan(x) and cot(x):
sec(x)=1/cos(x)
csc(x)=1/sin(x)
Unless there is a typo on the right-hand-side, I find the given identity not true.
i put it in my graphing calculator, though, and they graph the same function
This is why I suspected there is a typo.
The left-hand-side evaluates to -2csc(x).
The right-hand-side, 2*csc(x).
I suggest you recheck the expressions posted.
Here's a plot of each side of the identity as posted.
http://img508.imageshack.us/img508/3851/1294005524.png
The left-hand-side evaluates to -2cot(x).
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