Question

যদি ৪sec²x - 7tan²x = 11 এবং 0° < x < 90°, তাহলে x =?​

Answer 1

Answer:

x = 60°

Step-by-step explanation:

=>8sec^2x - 7tan^2x = 11

=>8sec^2x - 7(sec^2x - 1)= 11

=>8sec^2x - 7sec^2x + 7 = 11

=>sec^2x + 7 = 11

=>sec^2x = 4

=>secx = 2 and -2

=>since 0°<x>90°

• so

=>x = sec^-1secπ/3

=>x = π/3= 60°

hope it may helps you :-)