Question

7sin2x + 3cos2x = 4, solve for x.

Answer 1

Answer:

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.

Step-by-step explanation:

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