Question

Sec²A - tan²A = 1
Then A=90
Sec²90 - tan²90 = ?

Answer 1

Answer:

it's not defined bro. sec 90 has no value

Answer 2

Step-by-step explanation:

sec²90= Not defined

tan²90= Not defined

therefore

sec²90-tan²90= (Not defined )² - (Not defined)²

=0.