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यदि `cos theta =12/13, तब `sin theta(1+tan theta)` का मान ज्ञात कीजिए.

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दिया है `cos theta=12/13`
`implies ` आधार =12 तथा कर्ण =13
पाइथागोरस प्रमेय से, `("लम्ब")^(2)=("कर्ण")^(2)-(" आधार")^(2)`
`=(13)^(2)-(12)^(2)=169-144=25`
लम्ब =5
अब `sintheta=("लम्ब")/ ("कर्ण")=5/13` तथा `tantheta("लम्ब")/(" आधार")=5/12`
इसलिए `sin theta(1+tan theta)=5/13(1+(5)/(12))=5/13((17)/(12))=85/156`
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