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4 - sinA
------------
sinA. 1/cosA
4 - sinA
------------
sinA/cos A
5 - sinA
--------------
tanA
** 4cotA - cos A
4 × 1/tanA - cos A
4/tanA - cosA
4 - cosA.tanA
-----------------------
tanA
4 - cosA . sinA/cosA
----------------------------------
tanA
4 -sinA
-------------
tanA
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