问题描述:
证明下列恒等式(1)tan(x/2+π/4)+tan(x/2-π/4)=2tanx
(1)tan(x/2+π/4)+tan(x/2-π/4)=2tanx
(2)(1-2sinαcosα/cos²α-sin²α)=(1-tanα)/(1+tanα)
(1)tan(x/2+π/4)+tan(x/2-π/4)=2tanx
(2)(1-2sinαcosα/cos²α-sin²α)=(1-tanα)/(1+tanα)
问题解答:
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