根号3 /2SIN X-1/2COS X

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根号3/2SINX-1/2COSX根号3/2SINX-1/2COSX根号3/2SINX-1/2COSX根号3/2SINX-1/2COSX=sinxcos30-cosxsin30=sin(x-30)根号

根号3 /2SIN X-1/2COS X
根号3 /2SIN X-1/2COS X

根号3 /2SIN X-1/2COS X
根号3 /2SIN X-1/2COS X
=sinxcos30-cosxsin30
=sin(x-30)

根号3 /2SIN X-1/2COS X
=sin60sinx-cos60sin30
=cos(60-x)