Question 224457
which of the following trigometric wquations is false for all of x?
sin x= 2/ sqroot of 5
tan x= -100
sex x = sqroot of 3/ 7 
I suppose you mean sec(x).  I don't know of a sex trig function.
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If it's sec(x) = sqrt(3/7), that's never true (not for real numbers).
sqrt(3/7) is less than 1.
sec = 1/cos
The cos would have to be greater than 1, so that's not allowed.