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(i) "sin"theta cot theta + "sin"theta co...

(i) `"sin"theta cot theta + "sin"theta cosectheta = 1+ costheta`
(ii)`sectheta(1-"sin"theta) (sectheta+tantheta)=1`
(iii)`"sin"theta(1+"tan"theta)+costheta(1+cottheta)=sectheta+cosectheta`

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