Question

Show the identities you use to evaluate the following. No calculators allowed!
b. cot(π/2 – x) if tan x = -5

Answer 1

\[\cot(\frac{ \pi }{ 2 }-x)=\frac{ 1 }{ \tan(\frac{ \pi }{ 2 }-x)}\]
\[\tan(\frac{ \pi }{ 2 }-x)=\cot x\]
\[\frac{ 1 }{ \cot x }=\tan x\]
Does that help? @sfb