化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 05:29:02
![化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)](/uploads/image/z/561254-14-4.jpg?t=%E5%8C%96%E7%AE%80%3Atan45%C2%B0%2Bsin420%C2%B0%C3%971%2Ftan%EF%BC%88-60%C2%B0%EF%BC%89%2B1%2F2%EF%BC%88sin%E5%B9%B3%E6%96%B915%C2%B0%2Bcos%E5%B9%B3%E6%96%B915%C2%B0%EF%BC%89)
化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)
化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)
化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°)
原式=1-sin60°/tan60°+(1/2)*1
=1-cos60°+1/2
=1-1/2+1/2
=1.