tan²+sec-1=0.
sin²x+cosx-cos²x=0
1-cos²x+cosx-cos²x=
-2cos²+cosx+1=0
2cosx-cosx-1=0
(2cosx+1)(cosx-1)=0
2cosx1=-1
cosx1=-½
x1=120+k360
cosx2=1
x2=k360
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tan²+sec-1=0.
sin²x+cosx-cos²x=0
1-cos²x+cosx-cos²x=
-2cos²+cosx+1=0
2cosx-cosx-1=0
(2cosx+1)(cosx-1)=0
2cosx1=-1
cosx1=-½
x1=120+k360
cosx2=1
x2=k360