What is the logic behind adding/subtracting pi in the above formulas? I have heard from people that graphs can help but I'm not sure how.
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If you really must include pictures, please ensure they are all the right way up. – Angina Seng Jan 19 '19 at 07:28
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Apologies. Edited the question – user3508140 Jan 19 '19 at 07:30
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As Range of the function $f(x)$=$arcsin$ $x$ is $[-π/2,π/2]$......also for $arccos$ ,etc – Supriyo Banerjee Jan 19 '19 at 07:36
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https://math.stackexchange.com/questions/672575/proof-for-the-formula-of-sum-of-arcsine-functions-arcsin-x-arcsin-y – lab bhattacharjee Jan 19 '19 at 07:42