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(2sec theta+3 tan theta+5 sin theta -7co...

`(2sec theta+3 tan theta+5 sin theta -7cos theta+5)/(2tan theta+3 sec theta+5 cos theta +7sin theta+8)=`
(a) `tan (theta/2)`  (b) `cot (theta/2)`
(c)`sec (theta/2)`  (d)     `cosec (theta/2)`

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