- #1
Saitama
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- 93
Homework Statement
This is a question from my test paper.
If sec [itex]\theta[/itex]=[itex]\frac{4xy}{(x+y)^2}[/itex], where x,y [itex]\in[/itex] R, then
(a)x,y [itex]\in[/itex] R+
(b)x,y [itex]\in[/itex] R-
(c)x=y[itex]\neq[/itex]0
(d)x[itex]\in[/itex]R+, y[itex]\in[/itex]R-
Homework Equations
The Attempt at a Solution
I don't understand what i have to do and where should i start with?