sin67 = cos23

This is a true comment.

sin67 = 0.9205

cos23 = 0.9205

Usually if `alpha` is any small angle;

`sinalpha = cos(90-alpha)`

`cosalpha = sin(90-alpha)`

If `alpha = 67` then;

`90-alpha = 90-67 = 23`

sin67 = cos23

This is a true comment.

sin67 = 0.9205

cos23 = 0.9205

Usually if `alpha` is any small angle;

`sinalpha = cos(90-alpha)`

`cosalpha = sin(90-alpha)`

If `alpha = 67` then;

`90-alpha = 90-67 = 23`