Question

verify the identity.

cot (x-pi/2) = -tan x

Answer 1

I'm so stumped on this one. I can't figure it out at all, and I couldn't find any problems like it that might've been asked in the past.... lol

Answer 2

do you know the formula of cot(A-B) ?

Answer 3

\(\huge cot(A-B)=\bf \frac{cotAcotB+1}{cotB-cotA}\)

Answer 4

@zeeke u here?

Answer 5

Ah sorry, I was out for a bit. I assumed that's how it would begin, but I got a bit confused by what happens afterwards.

Answer 6

(cot x cot pi/2 + 1)/ (cot pi/2 - cot x)?

Answer 7

cot pi/2 = 0
so if we plug this value into the above formula we get
(0 +1) / (0 - cotx) = -1 cot x = -tan x

Answer 8

@welshfella oh perfect! Thank you! I gave you a medal! :)

Answer 9

ty yw