Question

sec x +tan x =3 then cos x=

Answer 1

Answer:

cos= 3(1-sin x)

Step-by-step explanation:

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Answer 2

Answer:

We know that (secx+tanx)(secx-tanx)=1

(secx-tanx)= 1/(secx+tanx)

Given secx+tanx=3

so secx-tanx = 3 ...(1)

secx+tanx=1/3 ...(2)

adiding equation(1) & (2) we get

2secx =10/3

secx=5/3

cosx=3/5

hence this the answer.