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to simplify Cosx=Sinx Tanx you should remember your fundamental and pythagorean identities..

Cosx + Sinx Tanx

Cosx + Sinx (Sinx/Cosx) <---------- From Tanx= Sinx/Cosx

Cosx + Sin2x/ Cos x <------------- do the LCD

Cosx (Cosx/Cosx) + Sin2x/Cosx

(Cos2x+Sin2x)/Cosx

1/Cosx <--------- From Sin2x + Cos2x =1

or Secx <-------- answer

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Q: How do you simplify cosx plus sinx tanx?
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