计算﹙sin3π/8﹚/﹙cos3π/8﹚-tanπ/8的结果为

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计算﹙sin3π/8﹚/﹙cos3π/8﹚-tanπ/8的结果为
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计算﹙sin3π/8﹚/﹙cos3π/8﹚-tanπ/8的结果为
计算﹙sin3π/8﹚/﹙cos3π/8﹚-tanπ/8的结果为

计算﹙sin3π/8﹚/﹙cos3π/8﹚-tanπ/8的结果为
﹙sin3π/8﹚/﹙cos3π/8﹚-tanπ/8
=sin(π/2-π/8 )/cos(π/2 -π/8 )-tanπ/8
=[(cosπ/8) /(sinπ/8) ]-[(sinπ/8) /(cosπ/8)]
=[cos^2π/8 -sin^2π/8 ]/[sinπ/8 *cosπ/8 ]
=2[cosπ/4 ]/[sinπ/4 ]
=2