Question

solve for x:
sec(x) * cos ((pi/2) - x) = -1

Answer 1

s\[secx \cos(\frac{ \Pi }{ 2 }-x) = -1\rightarrow secx sinx = -1 \rightarrow \frac{ sinx }{ cosx }=-1\]
tanx = -1
\[tanx = \tan 135^{0} \rightarrow x = 135^{0}\]