You can put this solution on YOUR website! sec^2x=9
I don't understand how to solve this problem.
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It's not a problem, it's an equation.
A problem might be,
solve the equation for x
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sec^2(x)=9
sec(x) = 3
cos(x) = 1/3
x =~ 70.529 degs
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cos(x) = -1/3
x =~ 109.471