Question

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Answer 1

Step-by-step explanation:

We have 7cos

2

θ+3sin

2

θ=4

⇒ 7(1−sin

2

θ)+3sin

2

θ=4

4sin

2

θ=3

sin

2

θ=

4

3

=(

2

3

)

2

sin

2

θ=sin

2

3

π

θ=nπ±

3

π

, nϵZ