also prove that
arccosx = 2arccos sqrt ( (x+1)/2 )
for the first one i let the LHS be y but didnt know where to go next
for the second one i cosined both sides but am still unsure
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Hello, b0mb3rz! Prove that: . Let .
The right side is: .
Take the cosine of both sides: . . .
Substitute  into : .
We have: . . . Then: .
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