![](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>)
In the triangle ABC, sin (a + b) + sin (a-b) = radical 6 / 2, cos (a + b) + cos (a-b) = radical 2 / 2, then B= Seek the process!
sin(A+B)+sin(A-B)=sinAcosB+cosAsinB+sinAcosB-cosAsinB=√6/22sinAcosB=√6/2sinAcosB=√6/4 …… ①cos(A+B)+cos(A-B)=cosAcosB-sinAsinB+cosAcosB+sinAsinB=-√2/22cosAcosB=-√2/2cosAcosB=-√2/4 …… ② (1 / 2)
RELATED INFORMATIONS
- 1. In the triangle ABC, CD is the height on the side of AB, ab = 13, BC = 12, AC = 5. Find the area of △ ABC
- 2. English abbreviations: AC, DNA, BC, CBA, PhD, BTV, DJ, PC, GMT, ztv in Chinese
- 3. Add a number to the numerator and denominator of 9 / 19 so that the result is equal to 2 / 3. What is the number added together? Please don't use the solution equation. If you must use the solution equation, please write me the calculation process in detail,
- 4. The square of a few plus 73 equals the square of a few
- 5. In the triangle ABC, ∠ ACB = 90 °, CE ⊥ AB at point E, D is the point above AB, ad = AC, AF bisects ∠ CAE and intersects CE at point F Please guess the relationship between FD and BC and prove your conjecture
- 6. The greatest common factor of 8 and 12 is ()
- 7. What is the greatest common factor of 18 and 12______ The least common multiple of 6 and 12 is______ ．
- 8. The least common multiple of 24 and 12 is () times their greatest common factor
- 9. It is known that the greatest common factor of a and B is 60, the least common multiple is 720, and one of them is 180. What is the difference between the two numbers Ladies and gentlemen,
- 10. The greatest common divisor of two numbers is 60, the least common multiple is 720, and one of them is 180. What is the difference between the two numbers?
- 11. If the value range of function y = LG (x2 + 2x + m) is r, then the value range of M is () A. m＞1B. m≥1C. m≤1D. m∈R
- 12. If a > 0 and a is not equal to 1, f (x) = alg (x2-2a + 1) has a minimum, then the solution set of inequality a is?
- 13. A + B = 0, the absolute value of a is 3, find the absolute value of a-b
- 14. What is the difference between the result of his calculation and the correct answer?
- 15. 1-13 / 14 × 7 / 9-2 / 9 △ 14 / 13 (simple calculation)
- 16. The slope of the line 3x + 4y-12 = 0 and the intercept of the y-axis are
- 17. Please! In the rectangular coordinate system, the points a (2a, a + B-1), B (- B, A-1) are symmetric about the origin, so find the value of a + B It's a process! Please, please!
- 18. If the positive integer solution of inequality 3x-a ≤ 0 is 1, 2, 3, then the value range of a is 1______ ．
- 19. How to solve this equation: 8:0.01 = 2 / 3: x The final answer is 1 / 1200, how to write the process
- 20. 6 / 7 x 3 / 1 + x = 11 / 14, 1 / 3 x = 24,