Question

plzz explain...... ​

Answer 1

tan^2 Φ =sec^2 Φ-1

4tan^2 A+3=0

4(sec^2 A-1) +3=0

4sec^2 -4 +3=0

4 sec^2 A=1

sec^2A=1/4

sec A=1/2

or

2 secA=1