Find an equation of the tangent line to the curve with parametric equationsx = t sin t,y = t cos t at the point (0,−π).

Find the equation of the line OP /> find an equation for a line that is normal to the graph of y = xe^x and goes 这么做这数学(find the equation of the tangent) Find an equation of the tangent line to the graph of the function f(x) = 8/(√x^2+3x) at the point (1,4) Find an equation of the line tangent to the graph of 4/x^4 at (3,4/81)and 3/x^4 at (5,3/625) 原题是英文In questions 12-13,line t is tangent to the circle C1,of equation x2+y2-8x+10y+28=0 at (1,-3).t is also tangent to the circle C2 whose center is (3,-3).12.Find an equation of t.13.Find the standatd equation of C2.翻译：在12,13题 find an equation of the tangent line to the curve y=6xsinx at the point(π/2,3π)求y Find an equation of the tangent line to the curve with parametric equationsx = t sin t,y = t cos t at the point (0,−π). Find all of the solutions of th equation cosx+cos2x=0 Find all of the solutions of th equation cosx+cos2x=0 Graph and find the slope of the following equation :Y = 100 – 20 X 一道曲线方程的题,麻烦帮解答下,The curve with equation y2 = x3 +3x2 is called the Tschirnhausen cubic.Find an equation of the tangent line to this curve at the point (1,−2).tschirnhausen cubic我不知道是什麽意思,就是要 一道曲线方程的题,麻烦帮解答下,The curve with equation y2 = x3 +3x2 is called the Tschirnhausen cubic.Find an equation of the tangent line to this curve at the point (1,−2).tschirnhausen cubic我不知道是什麽意思,就是要 第一道the curve with equation y^2=x^3+3x^2 is called the Tschirnhausen cubic.,find an equation of the tangent line to this curve at point (1,-2).还有个微分的题SinX+CosY = sinXcosY 1 The line l has equation 2x-y-1=0.The line M passes through the point A (0,4) and is perpendicular to the line l.(a) Find an equation of m and show that the lines l and m intersect at the point P (2,3).the line n passes through the point B(3,0) and find the equation of the tangent at (0,2) to the circle with equation(x+2)平方 + (y+1)平方=13 Find the equation of line tangent to the graph of f(x)=e+ln x at x=1? Find the equation of the perpendicular bisector of A(-2,1)and B(4,-5)perpendicular垂直bisector 等分