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प्रश्न
Write the value of ` sec^2 theta ( 1+ sintheta )(1- sintheta).`
उत्तर
`sec^2 theta (1+ sin theta ) (1- sin theta)`
=`sec^2 theta (1 - sin^2 theta)`
=`1/ cos^2 theta xx cos^2 theta`
= 1
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