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(i) (sec theta-cos theta)(cosectheta-"si...

(i)` (sec theta-cos theta)(cosectheta-"sin"theta)=(1)/("tan"theta+cottheta)`
(ii)`("sin"theta+sectheta)^(2)+(costheta+cosectheta)^(2)=(1+secthetacosectheta)^(2)`

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