Given that the square of F (x) = - (cosx) - 2asinx + A has the minimum value - 2 on [0, Pai], find the value of A

Given that the square of F (x) = - (cosx) - 2asinx + A has the minimum value - 2 on [0, Pai], find the value of A

A = (root 5 minus 1) divided by 2

The function f (x) = sin (x + Pai / 6) + sin (x-pai / 6) + cosx + a (a belongs to R and is a constant). Find the minimum positive period (2) of (1) f (x). If the sum of the maximum and minimum values of f (x) on [- Pai / 2, Pai / 2] is root sign 3, find a

Sin (x + Pai / 6) + sin (x-pai / 6) = 2sinxcospai / 6
=Root 3sinx
F (x) = root 3sinx + cosx + a = 2Sin (x + 30 °) + A
So the minimum period is 2 π
If the maximum and minimum values of function f (x) on [- Pai / 2, Pai / 2] are x + 30 ° = π / 2 and x = π / 2, respectively
Then f (x) max = 2 + a
F (x) min = - radical 3 + A
SO 2 + a-radical 3 + a = radical 3
A = root 3-1

（1/4X+52)=5/7X = = X=112

If both sides of the equation are multiplied by 28 at the same time, it becomes 7x + 52 * 28 = 5 * 4x 13X = 52 * 28 x = 112

A barrel of oil weighs 180 kg. Half of it is used and 100 kg is left. How many kg are the oil and the barrel?

Net weight of oil: (180-100) × 2, = 80 × 2, = 160 (kg). Barrel weight: 180-160 = 20 (kg). Answer: oil weight is 160 kg, barrel weight is 20 kg

The continuity and differentiability of functions are discussed
The continuity and differentiability of F (x) = | SiNx | at x = 0 are discussed

x→0+
lim |sinx| =lim sinx =0 =sin 0
x→0-
lim sinx = lim -sinx =0 =sin 0
Both sides are continuous. So continuous
x→0+
lim (|sinx|-|sin0)|/(x-0) =lim sinx/x =1
x→0-
lim (|sinx|-|sin0)|/(x-0) = lim -sinx/x =-1
The left and right derivatives are not equal, so they are not differentiable

C language, how to operate this arithmetic expression? A + = a - = a * = a;

In C language, the order of calculation is mostly from right to left
I suggest you try it on the computer, the result is always 0;
#include
using namespace std;
int main()
{
double a;
cout

The first paragraph describes the scenery of the Three Gorges (season), and the sentence describing the rapidity of the water flow is

The first paragraph describes the scenery of the Three Gorges (season), and the sentence describing the rapidity of the current on the side is: "or the king's order is urgent. Sometimes he sends the White Emperor in the morning and arrives at Jiangling in the evening. During that time, he travels for a thousand and two hundred miles, though he can't catch the wind quickly."

(1 - √ cosx) / X (1-cos √ x) how to find the limit when x tends to zero with the property of infinitesimal

Equivalent Infinitesimal Substitution, when X - > 0
1-√cosx=(1-cos x)/(1+vcos x)~x^2/4
x(1-cos √x)~x*x/2=x^2/2
Original formula = Lim {X - > 0} (x ^ 2 / 4) / (x ^ 2 / 2) = 1 / 2

The number of girls in class 61 is four fifths of that of boys. There are 54 students in the class. How many boys are there?

54 / (1 + 4 / 5) = 30 (people), good children who love to learn, come on!

19952-1994 × 1996 (calculated by simple method)

The original formula = 19952 - (1995-1) (1995 + 1) = 19952-19952 + 1 = 1