"表示度.sin(65"-x)cos(x-20")+cos(65"-x)cos(110"-x)

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"表示度.sin(65"-x)cos(x-20")+cos(65"-x)cos(110"-x)"表示度.sin(65"-x)cos(x-20")+cos(65"-x)cos(110"-x)"表示度.s

"表示度.sin(65"-x)cos(x-20")+cos(65"-x)cos(110"-x)
"表示度.sin(65"-x)cos(x-20")+cos(65"-x)cos(110"-x)

"表示度.sin(65"-x)cos(x-20")+cos(65"-x)cos(110"-x)
sin(65°-x)cos(x-20°)+cos(65°-x)cos(110°-x)
=(1/2)[sin45°+sin(85°-2x)+cos(175°-2x)+cos45°]
=(1/2)[sin(85°-2x)-sin(85°-2x)+√2]
=√2/2.