简单计算器，可以实现⑴正弦sin⑵余弦cos⑶正切tan⑷开平方sqrt⑸反正弦arcsin⑹反余弦arccos⑺反正切arctan⑻常用对数lg⑼自然对数ln⑽ｅ指数exp⑾乘幂函数∧-A simple calculator, you can achieve of ⑴ sine sin ⑵ the cosine cos ⑶ tangent tan ⑷ open square sqrt ⑸ anyway chord arcsin ⑹ inverse cosine arccos ⑺ arctang