问题
填空题
tan1°tan2°tan3°…tan89°=______.
答案
tan1°tan2°tan3°…tan89°
=(tan1°?tan89°)(tan2°?tan88°)…(tan44°?tan46°)?tan45°
=1.
tan1°tan2°tan3°…tan89°=______.
tan1°tan2°tan3°…tan89°
=(tan1°?tan89°)(tan2°?tan88°)…(tan44°?tan46°)?tan45°
=1.