Question

Among sin 90°, cos 90°, tan 90°, cot 90°, sec 90° and cosec 90°; which is/are not defined ?

Answer 1

sin 90° =1 

cos 90° = 0 

tan 90° = not defined 

cot 90° = 0 

sec 90° = not defined 

cosec 90° = 1 

∴ tan 90°, sec 90° are not defined.