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Solve the following trigonometric equati...

Solve the following trigonometric equations,
(i)`2cos^(2)theta-5"sin" theta+1=0`
(ii)`2"sin"^(2)theta-5"sin" theta+1=0`
(ii)`2"sin"^(2)theta+sqrt(3)costheta+1=0`
(iii)`2cos^(2)theta=3"sin"theta`.

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