(高一数学)化简:1-sin40°⼀cos40°.求过程

(1-sin40°)⼀cos40°
2024-12-26 16:38:22
推荐回答(1个)
回答1:

(1-sin40°)/cos40°

=(1-cos50°)/sin50°

=2(sin25°)^2/(2sin25°cos25°)
=sin25°/cos25°
=tan25°

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