How to find the maximum, minimum, range and definition of sine, cosine and tangent functions

First of all, the range of angles can be obtained, and then the maximum, minimum and range of these functions can be obtained according to their increasing and decreasing properties. The definition domain of sine and cosine functions is r, and the definition domain of tangent functions is x, which is not equal to K π + 2 / 2 π

RELATED INFORMATIONS

1. It is proved by definition that if xn > 0 (n = 1,2,...), and lim (n →∝) xn = a > = 0, then LIM (n →∝) √ xn = √ a
2. Let x1, X2 Xn is the sample of population x, the population variance exists, Xbar is the sample mean, find the correlation coefficient between X1 and Xbar
3. ∫（lnx/x^3）dx
4. In the function given below, it is not only an even function with period π, but also an increasing function on the interval (0, π / 2) A.y=x^2(x∈R） B.y=|sinx|(x∈R） C.y=cos2x(x∈R） D.y=e^(sin2x)(x∈R）
5. If (5x-60) &# 178; and the radical Y-3 are opposite to each other, then the value of the radical X-Y is ()
6. The scores of ten students in the first group of Mathematical Olympiad are as follows: 95, 93, 97, 88, 89, 97, 92, 90, 89, 94 Total score
7. 3, - 3,8, - 8 are 24 points-
8. It is known that the length of the diagonal of a cuboid is root 29, and the sum of length, width and height is 9. The surface area of the cuboid can be obtained Specific process and answer, please do it
9. The solution of the equations 3x + 8y = 128x + 3Y = - 1 is
10. If P is a point on the ellipse x ^ 2 / 4 + y ^ 2 = 1, F1 and F2 are the two focal points of the ellipse, and ∠ f1pf2 = 60 degrees, then the area of △ f1pf2 is__
11. No matter how the sliding rheostat slides, the voltage of the appliance or resistor will remain unchanged. If it changes, what will happen? Is there one more resistor in series? 2. The voltmeter is connected between the positive and negative poles of the power supply, but there is an electrical appliance in the middle. What will be the consequence? 3. The voltmeter is connected between two points of ab. there is a bulb before AB, but the voltmeter has no indication, which means that the bulb has short circuit indication, but the lamp has open circuit. What does it mean? The change in question 1 refers to the change in the resistance of electrical appliances or series connection. If it does not change, why use sliding rheostat to change the voltage in the test to explore the relationship between current, voltage and resistance? The third question should be what happened when the voltmeter didn't show the number
12. Equation problem (primary oh) on three ah Equation problem (primary oh) on three ah ① Master Wang processes 460 auto parts, and there are 160 unprocessed parts after 6 days. How many auto parts does Master Wang process every day? ② The two ships, a and B, set out from the same Wharf in opposite directions at the same time, sailing for 5 hours, with a distance of 225 km. How many kilometers does ship a travel per hour and ship B travel per hour? ③ It costs 0.9 yuan more to buy 3 pencils than 5 ballpoint pens. The price of each ballpoint pen is 0.6 yuan. How much is each pencil? There are only three questions. Read the questions carefully. Don't lose the decimal point. Well, I hope you can use the equation for every question~
13. Mathematics application problem, urgent, master, please enter! 1. What's the area of the circle around this 2 m circle with a 10 m diameter flower bed? 2. The perimeter of a square is 7 / 10. How many meters is its side? How many square meters is its area? 3. Calculation [3 / 4-0 divided by (1 / 7 + 2 / 13)] X1 and 1 / 4 [2 - (11.9-8.4x1 and 1 / 3)] divided by 1.3 Please make a formula
14. 1. Which brand of packaged milk is more cost-effective? Brand volume price / yuan Yili 3 L 20 Mengniu 2000 ml 18.6 2. A cuboid container, the bottom of which is 3 decimeters long and 3 decimeters wide. 1. After putting a stone (completely immersed), the water surface rises by 0.3 decimeters. What is the volume of this stone? 3. There is a 15 cm long and 10 cm wide rectangular glass container with some water in it. If you put four eggs (simply immerse them in water), and the water surface rises by 2 cm, what is the average volume of each egg? The above is the title of the mathematics guidance series P26 and p27 1. The ice used in Harbin Ice and snow world can melt into 80000 cubic meters of water every year. How many swimming pools are they equal to the storage capacity of 50m long, 25m wide and 1.2m deep? This is question 11 in math book P54 We need answers at 10 p.m
15. The starting price of a taxi in a city is 8 yuan (within 3 kilometers), more than 3 kilometers, with an average of 1.8 yuan per kilometer. Dongdong pays 13.4 yuan from home to Wal Mart. How far is Dongdong from Wal Mart?
16. A 200m long train passes the 1.6km long bridge at 15mgs. How long does it take for the train to pass the bridge?
17. There are more than 40 toys in a batch, which are divided into 4 classes or 6 classes on average. All these toys can be divided exactly. How many toys are there in this batch?
18. Uncle Li is going to buy a washing machine with the original price of 1800 yuan. How much does it actually cost? How much is the discount
19. Xiaowen bought a 567 yuan item in a shopping mall during the promotion period. How much do they actually need to pay? (shop poster: if you shop more than 200 yuan, you can reduce the price by 12%). And explain the solution I know how to do it, but it's wishful thinking. Help me explain the solution
20. During the "Eleventh five-star" period, five-star shopping malls carried out promotional activities. The original price of a color TV set was 2800 yuan, but the current price was 700 yuan lower than the original price. How much lower?