pre-calc help !!!!!!!

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#1 cos x+sec x=2

#2 (1+tan x)^2= 2 tan x+2

#3 cos^2x-sin^2 x+1=cos x


please show all work & thanks

  • pre-calc help !!!!!!! -

    cos x + 1/cos x = 2

    cos^2 x -2 cos x + 1 = 0

    (cos x - 1)(cos x - 1) = 0
    cos x = 1
    x = 0

    Now you do some

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