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यदि `cosectheta=(13)/(12),` तब `(2sin theta-3cos theta)/(2sin theta-9cos theta)` का मान ज्ञात कीजिए.

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यहाँ दिया है, `(2 sintheta-3cos theta)/(4 sin theta-9cos theta)`
अंश व हर को `sin theta` से भाग करने पर,
`=(2-cot theta)/(4-9cottheta)" "...(1)`
यहाँ `cosec theta=(13)/(12)`
`therefore cot theta=sqrt(cosec ^(2)theta-1)=sqrt(((13)/(12))^(2)-1)=5/12`
यह मान समीकरण (1 ) में रखने पर
`(2-3cos theta)/(4-9cot theta)=(2-3.(5)/(12))/(4-9.(5)/(12))=3`

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