Question

the value of 7sec^2A-7tan^2A is equal to
a)1
b)0
c)7
d)-7​

Answer 1

Step-by-step explanation:

$7 { \sec}^{2} \alpha - 7 { \tan}^{2} \alpha \\ 7( { \sec}^{2} \alpha - \tan ^{2} \alpha ) \\ 7 \times 1 = 7$

(c)7 is the right answer.