hello I read in textbook that the solutions of sinθ is k360+θ or k360+180-θ the solutions of cosθ is k360+θ or k360-θ the solutions of tanθ is k180+θ 1) what does the OR mean exactly? to get all the solutions we ADD (so AND, not OR) the expressions of the solutions? I understand OR, as if I can use only one of those (eg. for sinθ I can use only k360+θ OR k360+180-θ) and I will find all the solutions? 2) does these apply when θ is negative? so if the solution I get from the calculator is negative, do I process it with its negative sign? thanks!