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[" If "5cos2 theta+2cos^(2)theta/2+1=0,-...

[" If "5cos2 theta+2cos^(2)theta/2+1=0,-pi

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Solve the following equation 5cos2 theta+2(cos^(2))(theta)/(2)+1=0,-(pi)/(2)

If 5cos2 theta+2cos^(2)theta=0,-pi

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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