Finding the maximum and minimum of the function y = - 4cos & sup2; x-4sinx + 6

Finding the maximum and minimum of the function y = - 4cos & sup2; x-4sinx + 6

y=-4(1-sin²x)-4sinx+6
=(2sinx -1)²+1
Let t = 2sinx, - 2

Find the maximum and minimum value of the function y = 3-4sinx-4cos ^ x, and write that the maximum value of the function is the corresponding value of X

From city a to city B, it takes a third of an hour for car a and a quarter of an hour for car B. what's the speed of car a

Three quarters

We use the letter A to represent a rational number, and try to judge whether the following statements are correct. If not, please give counter examples. (1) a must be a positive number, - a must be a negative number; (2) if a is zero, then - A is a negative number; (3) if - A is a positive number, then a must be a non positive number

(1) Error, a = - 3, - a = 3; (2) error. A = 0, - a = 0; (3) error. Non positive numbers include zero and negative numbers

In 2012, Shenzhou 9 was successfully launched. The three astronauts on board are___ 、___ And___ Shenzhou-9 and its launch in 2011_____ Rendezvous and docking are realized

Male astronauts Jing Haipeng, Liu Wang and female astronaut Liu Yang

The square of x minus x minus 1 equals to the process of 0 equation

x²-x-1=0;
(x²-x+1/4)-5/4=0;
(x-1/2)²=5/4;
x-1/2=±√5/2;
x=1/2±√5/2;

Stress analysis of arch bridge

The arch bridge has the advantages of strong bearing capacity and beautiful appearance. Compared with the concave bridge, the convex bridge needs a centripetal force F, which is provided by the gravity mg and the supporting force n. drawing and force analysis show that: the arch bridge: F = mg-n1  N1 = Mg-F, the concave bridge: F = n2-mg  N2 = F + Mg, N1 = Mg + Mg

5x-3.7=8.5

5x-3.7=8.5
5x=3.7+8.5
5x=12.2
x=12.2/5
x=2.44

The distance between a and B is 20 kilometers. A starts 45 minutes before B starts. They are going in the same direction. A's speed is 8 kilometers per hour
B's speed is 6 kilometers per hour. How long can a catch up with B

8 × 3 / 4 = 6 km
20-6 = 14 km
14 ÷ (8-6) = 7 hours

Given AB = 60, a + B = 17, find a, B

This is 17 (a + b) and we will be 17 (a + b) and we will be 17 (a + b) and we will be 17 (a + b) and we will be 17 (a; a; a; a; (b) and we will be 178; (; (; (b) \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\, a = 12b = 5, ② a + B = 17a-b = - 7, a =