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Write 'True' or 'False' and justify your answer in each of the following:
$ (\tan \theta+2)(2 \tan \theta+1)=5 \tan \theta+\sec ^{2} \theta $.
Given:
\( (\tan \theta+2)(2 \tan \theta+1)=5 \tan \theta+\sec ^{2} \theta \).
To do:
We have to find whether the given statement is true or false.
Solution:
We know that,
$\sec ^{2} \theta-\tan ^{2} \theta=1$
Therefore,
$(\tan \theta+2)(2 \tan \theta+1)=2 \tan ^{2} \theta+4 \tan \theta+\tan \theta+2 $
$=2(\sec ^{2} \theta-1)+5 \tan \theta+2$
$=2 \sec ^{2} \theta+5 \tan \theta$
The given statement is true.
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