tan(π/8)/(1-tan²(π/8))的值
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tan(π/8)/(1-tan²(π/8))的值tan(π/8)/(1-tan²(π/8))的值tan(π/8)/(1-tan²(π/8))的值原式=1/2*2tan(π
tan(π/8)/(1-tan²(π/8))的值
tan(π/8)/(1-tan²(π/8))的值
tan(π/8)/(1-tan²(π/8))的值
原式=1/2*2tan(π/8)/(1-tan²(π/8))
=1/2*tan(2*π/8)
=1/2*tan(π/4)
=1/2
解
tan(π/8)/(1-tan²π/8)
=1/2[2tanπ/8/(1-tan²π/8)]
=1/2[tan(2×π/8)
=1/2tanπ/4
=1/2×1
=1/2