secx+sinx tanx=cosx

verify the trig identies
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1 Answer

secx+sinx tanx=cosx  are you sure it is a +?  it doesn't work if it is.

if it is a - then it works

secx - sinx tanx = cosx

   1    - sinx*sinx   = cosx

-------           -----

cosx            cosx

1 - (sinx)^2

---------------         = cosx

cosx

(cosx)^2 = cosx

-----------

cosx

cosx = cosx     proved

by Level 10 User (55.7k points)

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