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Solve: `cos4x=cos2x` |
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Answer» Given equation: `cos4x=cos2x` `rArr 4x=(2npi+-2x)` then, taking `+` sign `4x = 2npi+2x` or `4x-2x=2npi` `rArr x=npi, n in Z` or `4x+2x=2npi` or `6x=2npi rArr x=(npi)/(3), n in Z` Therefore, general solution of given equation is `x=npi`. or `x=(npi)/(3), n in Z` Ans. |
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