Hi. I need help on trigonometry.
I have a signal and a formula, which I found in a paper.
I wanna find theta (as in the formula). When using function atan(), my theta ranges from [-pi/4,pi/4]. In the paper, it mentions that theta should range from [-pi/2,pi/2], and we need to take the signs of numerator and denominator of the right-hand side of the formula into consideration when calculating theta.
My question is, how do I convert from [-pi/4,pi/4] to [-pi/2,pi/2] correctly? I know if I were to convert [-pi/2,pi/2] to [-pi,pi], I just have to use atan2() function, but in this case, it's a portion of full circle.
Please help and thank you.
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