Question

solve 7cos^2theta + 3sin^2 theta =4​

Answer 1

7sin2x + 3cos2x = 4

So, 4sin2x + 3sin2x + 3cos2x = 4

4sin2x + 3 (sin2x + cos2x) = 4

4sin2x + 3(1) = 4

4sin2x = 4 – 3

4sin2x = 1

sin2x = ¼

sin x = ½

So, x = 30 degree.

Answer 2

hope it will help u