- #1

karush

Gold Member

MHB

- 3,269

- 5

\frac{\cot {x}-1}{\cot{x}+1}&=\frac{1-\sin 2x}{\cos 2x}\\

\frac{\cos {x}-\sin x}{\cos{x}+\sin x}

\frac{\cos x-\sin x}{\cos x-\sin x}&= \\

\frac{\cos^2x-2\sin x\cos x+\cos^2 x}{\cos^2 x-\sin^2 x}

\end{align*}$

so far..