运用思想:降幂,切化弦
原式=(√3sin12/cos12-3)/{sin12}
=(√3sin12-3cos12)/(2cos24sin12)
=√3(sin12-√3cos12)/(sin24cos24 )
=-2√3sin48/(sin48/2)
=-4√3
运用思想:降幂,切化弦
原式=(√3sin12/cos12-3)/{sin12}
=(√3sin12-3cos12)/(2cos24sin12)
=√3(sin12-√3cos12)/(sin24cos24 )
=-2√3sin48/(sin48/2)
=-4√3