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Solve the following equation (i) 5cos2...

Solve the following equation
`(i) 5cos2theta+2cos^(2)"(theta)/(2)+1=0`, `-(pi)/(2) lt theta lt (pi)/(2)`
`(ii) sin7theta+sin4theta+sintheta=0`, `0 le theta le pi`
`(iii) tantheta+sectheta=sqrt(3)`, `0 le theta le 2pi`

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