高中数学-高考试题(上海交通大学 1931年三角函数方程)

问答题（1931年上海交通大学）

Find all the positive angles less than 360° which satisfy the equation:

cos2x+cosx+1=0

答案解析

暂无答案

讨论

高中数学

Homologous sides of two similar polygons have the ratio of 5 to 9 , the sum of the areas is 212 sq. ft. Find the area of each figure.

If two circles tangent at C and a common exterior tangent touches the circles in A and B, the angle ACB is a right angle.

Find the sum of the geometical series -2,,-1/3 to 6 terms.

Find the sum of the arithmetical series 49,44,39,… to 17 terms.

A motion picture film 120 feet long contains a certain number of individual pictures.If each picture were 0.1 of an inch shorter, the same film would contain 720 more pictures, how long is each picture?

Factor the following:4(a-b)²-12(a-b)(e+9e²)

Factor the following:4a-16b+4a+1.

Find the equation of the ruled surface whose generators are the system of the lines x-2y =4kx,k(x-2y)=4 and discuss the surface.

Find the equation of the sphere which passes through (1,5,-3),(-3,0,0) which center on the 3x+y+z=0,x+2y +1 = 0.

Find the equation of the plane passing through the line (x-x1)/a1 =(y-y1)/b1 =(z-z1)/c1 which is parallel to the (x-x2)/a2 =(y-y2)/b2 =(z-z2)/c2 .

三角函数

已知x∈(-π/2,0),cosx=4/5，则tan2x=【】

函数f(x)=sinx,x∈[π/2,3π/2]的反函数f-1(x)=【】

已知f(x)=1/2 sin2x，关于该函数的四个说法：①f(x)的最小正周期为2π；②f(x)在[-π/4,π/4]上单调递增；③当x∈[-π/6,π/3]时，f(x)的取值范围为[-√3/4,√3/4]；④f(x)的图像可由g(x)=1/2 sin⁡(2x+π/4)向左平移π/8个单位长度得到.正确的个数有【】个

计算3/2 cos-1+1/4 sin-1⁡(2√2π)/(2+π2 )+tan-1⁡(√2/π)的值为__________.

设2sinA=cosA,求sinA及cosA之值.

已知函数f(x)=sin⁡(ωx+φ)，如图A,B是直线y=1/2与曲线y=f(x)的两个交点，若|AB|=π/6，则f(π)=________.

设函数 f(x) = cos (ωx + π/6 ) 在 [−π, π] 的图像大致如下图, 则 f(x) 的最小正周期为【】。

已知 α ∈ (0, π), 且 3cos2α − 8cosα = 5, 则 sinα =【】

若 α 为第四象限角, 则【】

已知函数 f(x) = sin2xsin2x.(1) 讨论 f(x) 在 (0,π)上的单调性;(2) 证明: |f(x)| ⩽ 3/8;(3) 证明: sin2xsin22xsin24x . . . sin22nx ⩽ 3n/4n .

三角函数方程

已知cosx=(1-(M+1)sin2x)/(1+(M-1)sin2x)，求x的值.

Find all the positive angles less than 380° which satisfy the equation sinx+sin2xsin3x = 0.

已知函数f(x)=cosωx-1(ω>0)在区间[0,2π]有且仅有3个零点, 则ω的取值范围是__________.

若函数 f(x) = sin(x + φ) + cosx 的最大值为 2, 则常数 φ 的一个取值为__________.

求方程(sinx+cosx)2=1/2的解集.

求方程2sin(x+π/6)=1的解集.

方程4cos2x-4cosx+3=0的解集是【】

方程sinx-cosx=的解集是____________________.

方程sin2x=sinx在区间(0,2π)内的解的个数是【】

求方程 + sinx = 0在[0,2π)上的解.