log_{4}10 = use the change-of-logarithm formula

log_{10}10 / log_{10}4 = use the formula log_{c }a^{b} = b log_{c}a

= 1/(2log_{10}2) × log_{10}10.

Note that in fact log_{10}10 = 1 but it is required to write the expression as a multiple of a common logarithm (that is, a logarithm to the base 10).

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