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Mathematics 18 Online
OpenStudy (anonymous):

verify this identity tan (x+pi/2)= -cotx

OpenStudy (anonymous):

try convert -cotx to -1/tanx, then use the tan(a+b) formula to figure out what the left side is.

OpenStudy (anonymous):

I dont know how to do that :(

OpenStudy (anonymous):

Thanks @lailaiwd

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