![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The value of tan20 ° + tan40 ° + 3tan20 ° · tan40 ° is () A. 3B. -3C. 33D. -33
Tan20 ° + tan40 ° + 3tan20 ° · tan40 ° = Tan (20 ° + 40 °) [1-tan20 ° tan40 °] + 3tan20 ° tan40 ° = 3 [1-tan20 ° tan40 °] + 3tan20 ° tan40 ° = 3-3tan20 ° tan40 ° + 3tan20 ° tan40 ° = 3, so select a
RELATED INFORMATIONS
- 1. Compare sin20 ° with sin20 ° 15 '
- 2. What is 40 degrees
- 3. 4cos50°-tan40°=______ ．
- 4. What's the difference between 4sin40 and tan40? Please write down the detailed process In the middle is the minus sign
- 5. Tan20 degree + tan40 degree + root 3 tan20 degree, tan40 degree =?
- 6. What is Tan 40 ° - cot 40 degrees
- 7. In the form of a ± B, the growth rate is between 35% and 36%, and the temperature is between - 38.9 ° and - 41.1 ℃
- 8. -9 degrees centigrade Hurry
- 9. The temperature range is between 38.9 ℃ and 41.1 ℃, expressed as a ± B
- 10. The mercury surface of the thermometer is at 38 degrees centigrade. A student uses the same thermometer to measure the questions of a, B and C. The results show that a is 38 degrees centigrade, B is 38.5 degrees centigrade and C is 39 degrees centigrade A. A's temperature must be abnormal B. B's questions must be abnormal C. three students' questions must be abnormal d. A's questions must be normal Explain the process of thinking
- 11. Evaluate (tan5 ° - cos5 °) sin20 ° / 1 + cos20 °
- 12. What are the five ways of describing characters
- 13. What are the ways of character description? Such as the title
- 14. What are the ways to describe characters
- 15. What are the ways to describe characters (well, try to be less! We don't want to copy so much.)!
- 16. What are the methods of character description?
- 17. Is sin20 the opposite side divided by the hypotenuse? How much does sin20 wait? For example: tan20 = 0.364
- 18. It is known that the coordinates of the highest point and the lowest point of the image of the function f (x) = asin (ω X - π / 3) (a > 0, ω > 0) in a certain period are (5 π / 12,2), respectively, (11π/,-2) (1) Find the values of a and ω; (2) Given α ∈ (0, π / 2) and sin α = 4 / 5, find the value of F (α)
- 19. What are the parameters in the analytic expression y = asin (omega x + FAI)?
- 20. Let f (x) = asin (ω x + φ), X ∈ R (where a > 0, ω > 0,00,0)