How do you use the fundamental identities to simplify $cosusinu+tanucosu$ ?

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Answer 1 · 2017-02-08T17:12:45

$cosusinu+tanucosu=sinu(1+cosu)$

$cosusinu+tanucosu$

and as $tanu=sinu/cosu$

$cosusinu+tanucosu$

= $cosusinu+sinu/cosuxxcosu$

= $cosusinu+sinu$

= $sinu(1+cosu)$

How do you use the fundamental identities to simplify cosusinu+tanucosucosusinu+tanucosu?