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 .[1] The right side is: . Take the cosine of both sides: . . .[2] Substitute [1] into [2]: . We have: . . . Then: . Therefore: .
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