Fanduekisses
**PRECALC HELP PLEASE How to verify the identity tan(x+pi/2)=cotx ?



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Fanduekisses
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Do I USE the cofunction identity?

tkhunny
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You use whatever works. Let's see what happens when you use the cofunction identity.

Muhammad_Nauman_Umair
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tan(x+y) = (tan x +tan y) / (1 tan x tan y)


Fanduekisses
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ooooh I see so x is x and y is pi/2?


Fanduekisses
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so x + pi/2/ 1x + pi/2 ?

Fanduekisses
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is that correct?


Muhammad_Nauman_Umair
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tan x + tan 90/ (1 tan90 *tanx)

Muhammad_Nauman_Umair
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then divide numerator and denominator by tan 90 .
as u know tan 90 is "infinite"
and 1 / "infinte" = 0
Now try to solve it


Muhammad_Nauman_Umair
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(tan x/tan 90+1 ) / [(1 /tan 90)  tanx)]
