2. Given cos ( 7 12) determine an equivalent expression in terms of the related acute angle. a) − ( 6 ) b) −cos ( 5 12) c) − cos ( 12) d) − cos ( 4 )
3) Determine an equivalent expression in terms of the related acute angle for cos ( 17 12 ). a) − ( 6 ) b) −cos ( 5 12) c) − cos ( 12) d) − cos ( 4 )
