In mathematics, sin210 = sin (180 + 30) = - sin30 = - 1 / 2 sin (180 + 30) = - why is it negative? | Math enthusiast | Mathematical art

In mathematics, sin210 = sin (180 + 30) = - sin30 = - 1 / 2 sin (180 + 30) = - why is it negative?

Induction formula, function name unchanged, sign look at quadrant
210 ° is the third quadrant angle, so sin210 ° is the third quadrant angle

How much Fahrenheit is one degree centigrade?

Fahrenheit = 32 + C × 1.8
1C = 33.8f

What's the temperature of one degree Fahrenheit

The conversion relationship between centigrade temperature (℃) and Fahrenheit temperature (f) is as follows:
F = 9 / 5 ℃ + 32, or ℃ = 5 / 9 (f-32)

RELATED INFORMATIONS

1. How much centigrade is one degree Fahrenheit?
2. How much is 12 + 45?
3. How can five fives equal 123?
4. What is 15 minus three tenths?
5. A parallelogram and a triangle have the same area. The bottom of the parallelogram is twice the bottom of the triangle. The height of the triangle is 6 decimeters. What is the height of the parallelogram?
6. If a project is completed by Party A and Party B in 6 days, the manufacturer shall pay Party A and Party B 8700 yuan in total; if Party B and Party C are completed in 10 days, the manufacturer shall pay Party B and Party C 9500 yuan in total; if Party A and Party C are completed in 5 days, the manufacturer shall pay Party A and Party C 5500 yuan in total 【1】 How many days does it take for each team a, B and C to complete the whole project independently? 【2】 If the time limit is less than 15 days to complete the whole project, which pair will spend the least money to complete the project alone? Please explain the reason
7. /a-4/+/b-8/=0,a+b/axb=?
8. Work efficiency multiplied by work time is equal to the total amount of work
9. How many degrees is 40 degrees and 24 minutes
10. 3.14×62.56
11. Calculation: 160 ° 22'30 '
12. What's 160 times 30%
13. What is X-1 in 5 equal to 6 in 5
14. Mathematics problem, I am 1.71 meters, equivalent to how many feet, how many inches?
15. In fact, we think 0.9 cycle is about 1. In fact, 0.9 cycle equals 3 times 0.3 cycle equals 3 times one third equals 1. What's your mathematical view
16. Given that X / 3 = Y / 4 = m / 5 is not equal to 0, find the value of X + y + m / x + y-m The fraction should write the process, not the value directly
17. The following statement is wrong () A. 0 multiplied by any number will get 0b. 0 divided by any number will get 0C. Any number multiplied by 1 or divided by 1 will get the original number
18. 72 square meters = [] square decimeters = [] square centimeters
19. Xiaolan made a cylinder with a bottom area of about 3.14cm2 from a cone with a bottom area of 12.56cm2 and a height of 1.5cm______ cm．
20. A cylinder with a bottom area of 3.14 square centimeter and a height of 2 cm is made into three cones with a bottom area of 12.56 square centimeter. How high is the cone Take a cylinder with a bottom area of 3.14 square centimeter and a height of 2 cm and make three cones with a bottom area of 12.56 square centimeter with rubber clay. How high is the cone?