求值sinπ/8乘cosπ/8过程
问题描述:
求值sinπ/8乘cosπ/8过程
答
原式=1/2*(2sinπ/8cosπ/8)
=1/2*sin(2*π/8)
=1/2*sin(π/4)
=1/2*√2/2
=√2/4