Question
Mathematics Question on Trigonometric Identities
Choose the correct option. Justify your choice. 9 sec2A - 9 tan2A =
A
1
B
9
C
8
D
0
Answer
9
Explanation
Solution
9 sec2 A - 9 tan2 A
= 9 (sec2 A - tan2 A)
= 9 (1) [As sec2 A - tan2 A = 1]
= 9
Hence, alternative (B) is correct.