What is trigonometric function

Trigonometric functions include six basic functions: sine, cosine, tangent, Cotangent, secant and cosecant. For example, in the right triangle ABC, a, B and C are the opposite sides of angle a, angle B and angle C respectively, and angle c is a right angle. Then the following operation mode is defined: sin angle a = the opposite side length / oblique side length of angle a, and sin a is recorded as the sine of angle A

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1. Trigonometric function·· 1. If the minute hand of the clock is set forward 30 minutes, the number of radians the clock turns is If f '(x) = sin1 / 4x + cos 1 / 4x, then the distance between any two adjacent zeros of F' (x) is 3, the function f (x) = acosx + 2x is odd= It's a concrete process··
2. Finding trigonometric function The short side is a, the long side is B, the hypotenuse is C, the known long side is 200, BC is 5 degrees, find the short side a How to express it in the form?
3. Trigonometric function problem cosacos2a - 1 = cos3a cos2acos(n-1) - cos(n-2)a = cosna Please tell me what formula to use
4. In the acute angle △ ABC, the opposite sides of the inner angles a, B and C are a, B and C respectively. It is known that C = 2, 2sin2c-2cos2c = 1. Find (1) the radius of the circumscribed circle of △ ABC; (2) when B = 5 π 12, find the size of A
5. Trigonometric function problem! 2010 Zhejiang Li Shu In △ ABC, the edges opposite angles a, B and C are a, B and C, respectively. Given cos2c = - 1 / 4, find the value of sinc Only one of the answers is positive, but how to discard the negative?
6. What is the same angle trigonometric function
7. Find the value of tan44 ° cot45 ° tan46 °
8. Find the value of tan44 ` cot45 ` tan46 ' Find the value of tan44 ` cot45 ` tan46 ' Note: tan44'means tan60 degree, and "'" means "degree". In addition, this is an exercise in the geometry book of grade three Note: tan44 'means tan44 degree, and "'" means "degree". In addition, this is an exercise in the geometry book of grade three (I'm sorry that the above caption is wrong) I don't understand what's written on the first floor
9. What is the value of tan44 ° * cot45 ° * tan46?
10. Tan 60? - (COT 45? + 2Sin 60?) (4cos 60?)
11. Why are trigonometric functions: cos 45 ° / - Tan 45 ° - Sin 30 ° = - √ 2 / 2 / - 1-1 / 2, = √ 2 / 3,
12. 1. In the triangle ABC, we know a = 10, angle a = 45 degrees, angle B = 30 degrees. 2. We find the period and the maximum value of the function y = 3sin (2x + π / 3)
13. What are the values of 30, 45, 60 and 90?
14. How to find the angle according to the triangle function? It's not 30.45.60 For example, Sina = 0.33/1.6, what is the angle? How to find it?
15. How many days is 40:00
16. How many seconds is 100 milliseconds? Please, gods
17. 699 hours and 51 minutes is equal to how many days the gods help
18. How many hours is 3 hours, 40 minutes and 20 seconds,
19. How many hours is 1251635125 seconds
20. How many days is 4132