Question

There is a photo attached

tan 270 is incorrect!

Answer 1

`(1-\cos135^\circ)/(\sin135^\circ)=(1-\left(\cos^2 67.5^\circ-\sin^2 67.5^\circ\right))/(2\sin67.5^\circ\cos67.5^\circ)=(1-\left(1-\sin^2 67.5^\circ-\sin^2 67.5^\circ\right))/(2\sin67.5^\circ\cos67.5^\circ)=\medskip\\=(2\sin^2 67.5^\circ)/(2\sin67.5^\circ\cos67.5^\circ)=(\sin 67.5^\circ)/(\cos 67.5^\circ)=\tan 67.5^\circ`