Posted by Grace on Friday, January 1, 2010 at 6:01pm.
pi/2 surely works, (try subbing it in)
remember that 3pi/2 is 270º
tan 270º is undefined, so cot 270º = 0
LS = cot 3pi/2 = 0
RS = 1/sin 270 - 1 = 1/-1 - 1 = -2
so 3pi/2 does not work.
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