Tan, Cos and Sin Equations Watch

Xphoenix
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I know how to get the initial value via plugging in calculator, and I know you get the other solutions via factors of 180 or Pi. But how do you know which one is which for each separate equation? Like is there a set of rules?
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Arvin Bhambra
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use this link

www.s-cool.co.uk/a-level
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