2cosx=√2+√2+2cos4x

4 answers

not sure just how sloppy you are being with the parentheses, You might mean

√2+√(2+2cos4x)
or
√(2+√(2+2cos4x))

either way it's kinda sloppy
first step is probably to see what cos4x reduces to

2cosx

√2+√2+2cos4x=2cosx

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