英语翻译1.which of the following is equivalant to the equation x

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英语翻译
1.which of the following is equivalant to the equation x^2+5x+y^2-1=0 in polar form?
2.if A is a 2*3matrix ,and B is 3*4matrix,then the product of A times 3B is a matrix of which of the flolling dimensions?

1.下面的（数字）哪一个在极坐标形式中满足等式x^2+5x+y^2-1?
2.如果A是一个2*3的矩阵,B是一个3*4的矩阵,那么A乘以3B得到的矩阵的维度是下面的哪一个?
再问：第一题答案是r^2+5rcosθ-1=0 第二题答案是3*3 求详细过程?

which of the following is the equation of a line 1.Find the equation of the tangent to the curve y=x^2,which Which of the following is Which of the following is TURE according to the passage? Which of the following is NOT true according to the Which of the following is wrong according to the article? 英语翻译Under which of the following conditions is the magnitude 英语翻译全句是：According to the passage,which of the following is t which of the following is right according to this dialogue? write the equation of the tangent line to f(x)=x+x×x that is Which of the following sentences is correct? 5.Which of the following is wrong?...