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(i)(1)/(sectheta-"tan"theta)=(1+"sin"the...

(i)`(1)/(sectheta-"tan"theta)=(1+"sin"theta)/(costheta)=sectheta+"tan"theta`
(ii)`(1)/(sectheta+"tan"theta)=(1-"sin"theta)/(costheta)=sectheta-"tan"theta`

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