化简根号2COS(X-π/4)-sinx

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化简根号2COS(X-π/4)-sinx化简根号2COS(X-π/4)-sinx化简根号2COS(X-π/4)-sinx√2cos(x-π/4)-sinx=√2(cosxcosπ/4+sinxsinπ

化简根号2COS(X-π/4)-sinx
化简根号2COS(X-π/4)-sinx

化简根号2COS(X-π/4)-sinx
√2cos(x-π/4)-sinx
=√2(cosxcosπ/4+sinxsinπ/4)-sinx
=cosx+sinx-sinx
=cosx