Question

seventh sin square theta + 3 cos square theta equal to 4 then​

Answer 1

Answer:

Let theta=A

Then theta = A = 30°

Step-by-step explanation:

7sin^A + 3cos^A = 4. (given)

7sin^A + 3(1 - sin^A) = 4. [Since cos^A = (1 - sin^A)]

7sin^A + 3 - 3sin^A = 4

4sin^A + 3 = 4

4sin^A = 4-3

4sin^A = 1

sin^A = 1/4

sinA = 1/2

But , sin 30° = 1/2

Therefore,A = 30°

So theta = A = 30°

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