y 11. sec = 1 when = − 2π, 0, x x 2π; (– ) sec = −1 when = −π, 16 , 4 x x – π when = − 3π , π ; x 12. 2 2 x csc = −1 when = − π , x x ( ) , 4 csc x – – 3π 16 2 2 = 1 13. = sec has vertical asymptotes when y x 3π x , π , π , 3π =− − . 2 2 2 2
y 11. sec x = 1 when x = − 2π, 0, 2π; sec x = −1 when x = −π, π 16 (– – , 4 ) 12. csc x = 1 when x = − 3π , π ; 2 2 csc x = −1 when x = − π , 3π 2 2 16 x ( – – , 4 ) 13. y = sec x has vertical asymptotes when x 3π , π , π , 3π =− − . 2 2 2 2
62514-0132318806_ISM_02-1.docx