1、(1/2)负三次方×sin²30°减(根号(-cos30°)²)减2tan60°/根号3=2、在△ABC中,绝对值2sin²A-1绝对值+(根号3)(tanC-根号3)²=0,求∠B的度数.
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![1、(1/2)负三次方×sin²30°减(根号(-cos30°)²)减2tan60°/根号3=2、在△ABC中,绝对值2sin²A-1绝对值+(根号3)(tanC-根号3)²=0,求∠B的度数.](/uploads/image/z/11493513-9-3.jpg?t=1%E3%80%81%EF%BC%881%2F2%EF%BC%89%E8%B4%9F%E4%B8%89%E6%AC%A1%E6%96%B9%C3%97sin%26%23178%3B30%C2%B0%E5%87%8F%EF%BC%88%E6%A0%B9%E5%8F%B7%EF%BC%88-cos30%C2%B0%EF%BC%89%26%23178%3B%EF%BC%89%E5%87%8F2tan60%C2%B0%2F%E6%A0%B9%E5%8F%B73%3D2%E3%80%81%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E7%BB%9D%E5%AF%B9%E5%80%BC2sin%26%23178%3BA-1%E7%BB%9D%E5%AF%B9%E5%80%BC%2B%EF%BC%88%E6%A0%B9%E5%8F%B73%EF%BC%89%EF%BC%88tanC-%E6%A0%B9%E5%8F%B73%EF%BC%89%26%23178%3B%3D0%2C%E6%B1%82%E2%88%A0B%E7%9A%84%E5%BA%A6%E6%95%B0.)
1、(1/2)负三次方×sin²30°减(根号(-cos30°)²)减2tan60°/根号3=2、在△ABC中,绝对值2sin²A-1绝对值+(根号3)(tanC-根号3)²=0,求∠B的度数.
1、(1/2)负三次方×sin²30°减(根号(-cos30°)²)减2tan60°/根号3=
2、在△ABC中,绝对值2sin²A-1绝对值+(根号3)(tanC-根号3)²=0,求∠B的度数.
1、(1/2)负三次方×sin²30°减(根号(-cos30°)²)减2tan60°/根号3=2、在△ABC中,绝对值2sin²A-1绝对值+(根号3)(tanC-根号3)²=0,求∠B的度数.
1.8*(1/4)*-二分之根号3-2=负二分之根号三
2.绝对值-平方数=0,得绝对值=0 并且 平方数=0
所以a=45度
c=60度
所以角b=75度
(全都我一个字一个字打出来的,不懂再问)