- #1

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## Main Question or Discussion Point

**Why is this wrong???**

arcos(x)= ∫(-1)/√(1-x) dx = -∫1/√(1-x) dx = -arcsin(x)

⇒ arcos(x)=-arcsin(x)

i know this is wrong, i think its got something to do with constant of integration, could someone pls point out my mistake. thnks