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Solve the following equations:
i) `3(tan^(2)theta+sec^(2)theta)=5`
ii) `tan^(2)theta+cot^(2)theta=2`
iii) `7cos^(2)theta+3sin^(2)theta=4`

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i) `theta=npi+-pi/6`, ii) `theta=npi+-pi/4`
iii) `theta=npi+-pi/3`

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