求sinπ/8cosπ/8的值

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求sinπ/8cosπ/8的值求sinπ/8cosπ/8的值求sinπ/8cosπ/8的值1/2sinpi/4=1/2*根号2/2=根号2/4原式=1/2*2sinπ/8cosπ/8=1/2*sin(

求sinπ/8cosπ/8的值
求sinπ/8cosπ/8的值

求sinπ/8cosπ/8的值
1/2sinpi/4=1/2*根号2/2=根号2/4

原式 = 1/2 * 2sinπ/8cosπ/8
=1/2 * sin(π/8*2)
=1/2sinπ/4
=根号2/4