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Solve: 7cos^2theta+3sin^2theta=4...

Solve: `7cos^2theta+3sin^2theta=4`

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Given that,
`7cos^2theta+3sin^2theta=4`
`=> 7(1-sin^2theta)+3sin^2theta=4`
`=>7-7sin^2theta+3sin^2theta=4`
...
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