共50条信息
已知\(A(2,3)\),\(B(1,-1)\),\(C(-1,-2)\),点\(D\)在\(x\)轴上,则当点\(D\)坐标为________时,\(AB⊥CD\).
已知两曲线\(f(x)=2\sin x\),\(g(x)=a\cos x\),\(x∈\left( 0\mathrm{{,}}\dfrac{\pi}{2} \right)\)相交于点\(P.\)若两曲线在点\(P\)处的切线互相垂直,则实数\(a\)的值为____\(.\)
已知直线\({{l}_{1}}:2x+y-2=0,{{l}_{2}}:ax+4y+1=0\),若\({{l}_{1}}\bot {{l}_{2}}\),则\(a\)的值为\((\) \()\)
两直线\(3x+2y+m=0\)和\((m^{2}+1)x-3y-3m=0\)的位置关系是\((\) \()\)
\((\)Ⅰ\()\)求\(AB\)的中垂线方程;
\((\)Ⅱ\()\)求过\(P(2,-3)\)点且与直线\(AB\)平行的直线\(l\)的方程;
\((\)Ⅲ\()\)一束光线从\(B\)点射向\((\)Ⅱ\()\)中的直线\(l\),若反射光线过点\(A\),求反射光线所在的直线方程.
设直线\(l_{1}\):\(ax-by+4=0\),\(l_{2}\):\((a-1)x+y+b=0\),求满足下列条件的\(a\),\(b\)的值.
\((1)l_{1}⊥l_{2}\),且\(l_{1}\)过点\(M(-3,-1)\);
\((2)l_{1}/\!/l_{2}\),且原点\(O(0,0)\)到\(l_{1}\)和\(l_{2}\)的距离相等
已知函数\(f\)\((\)\(x\)\()=\)\(a\)\(\ln \)\(x\)\(- \dfrac{1}{x}\),\(a\)\(∈R\).
\((1)\)若曲线\(y\)\(=\)\(f\)\((\)\(x\)\()\)在点\((1,\)\(f\)\((1))\)处的切线与直线\(x\)\(+2\)\(y\)\(=0\)垂直,求\(a\)的值;
\((2)\)求函数\(f\)\((\)\(x\)\()\)的单调区间.
在平面直角坐标系\(xOy\)中,以坐标原点\(O\)为极点,\(x\)轴正半轴为极轴建立极坐标系,曲线\(C\)的极坐标方程为\(\rho =2\sin \theta \),\(\theta \in \left[ 0,2\pi \right)\).
\((\)Ⅰ\()\)求曲线\(C\)的参数方程;
\((\)Ⅱ\()\)在曲线\(C\)上求一点\(D\),使它到直线\(l\):\(\begin{cases} & x=\sqrt{3}t+\sqrt{3} \\ & y=-3t+2 \\ \end{cases}(t\)为参数\()\)的距离最长,求出点\(D\)的直角坐标.
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