cosx cosecx-sinxsecx/cosx+sinx=cosecx-secx
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cotx-tanx
=---------------
cosx+sinx
cos^2x+sin^2x. 1
------------------------ ×. ----------------------
sinxcosx. cosx+sinx
= cosx+sinx
---------------------
sinx cosx
=1/sinx+1/cosx
in 2nd quadrant cos is negative.
cosec x-secx
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