cos25°sin70°-sin20°cos65°

RELATED INFORMATIONS

• 1. cos25°*cos(α-25°)-cos65°*sin(α-25°)
• 2. The vector a = (1,2) B = (- 2, n) is known. The angle between a and B is 45 degrees
• 3. It is known that vector a = (1,2), vector b = (- 2, n) and the angle between vector a and B is 45 degrees (1) Finding the vector b (2) If the vector C and B are in the same direction, and C-A is perpendicular to a, find C
• 4. Given the vector a = (1,2), the vector b = (- 2, n), the angle between the vectors a and B is 45 °, find the vector B. if the vectors C and B are in the same direction, C-A ⊥ a, find C
• 5. Given vector a = (1,2), vector b = (- 2, n), the angle between vector a and B is 45 ° (1) find B (2) if C and B are in the same direction, and C-A ⊥ a, find C
• 6. Fill in the brackets with a real number so that the equation 1 − & nbsp; & nbsp;) cos10 ° sin20 ° sin10 ° cos20 ° = 2 holds. The real number is______ ．
• 7. Why is sin20 transformed into (sin10) ^ 2
• 8. The value of reduced trigonometric ratio cos2a + Tan 2A. Cos2a
• 9. Simplification of trigonometric function Tan (tan-1 (8 / 6) / 2) Tan-1 means arc tan That is to say, Tan times 1 / 2 (arc tan4 / 3) How to simplify, teach me five Sorry, 0.5 was pressed by my computer
• 10. Simplification of 2tanx + Tan (π / 2-x) by trigonometric function of higher one How to simplify, the problem is to find the minimum If Tan = t So 2T ^ 2 + 1 / T = if we change the above into binary [2 (T + radical 2 / 2) ^ 2-1] / T It should be the smallest when t = 0, But the denominator is t How to find the minimum?
• 11. How to calculate 55 * 0.98
• 12. 1+2+3+4+5+6+7+8+9.+81+82+83+84+85+86+87+88+89+90.
• 13. Mathematical Olympiad of primary school At 21:00 p.m. on March 19, 2012, the national development and Reform Commission issued the second fuel price increase in the year: it decided to increase the prices of gasoline and diesel by 600 yuan per ton from 0:00 p.m. on March 20, and the maximum supply prices of gasoline and diesel standard products for transportation, civil aviation and other special users after adjustment were 9580 yuan per ton and 8730 yuan per ton respectively. Sichuan Provincial Price Bureau decided to adjust the market oil price according to the national requirements from 0:00 p.m. on March 20 (1) A certain type of gasoline in Chengdu market is about 1277 liters per ton. The original price is 7.55 yuan per liter (2) When Mr. Zhang arrived at the gas station at 22:00, he found that there was only one gas dispenser open at the gas station, and there was a long queue of cars waiting for gas, and there were cars coming up behind him. In the process of waiting for refueling, Mr. Zhang found that it takes 3 minutes for each car to refuel on average, and the number of cars queuing behind increased by 2 every 3 minutes. When Mr. Zhang finished filling up, it was 23:12. At this time, the gas station decided to fill up all the waiting cars before adjusting the price of gasoline, so that the cars arriving at the station could fill up the gas without waiting. How many more gas dispensers should the gas station open at least?
• 14. (48 of 48 + 49) divided by 24
• 15. One plus eight plus 58 times 108
• 16. 1 divided by 35 percent equals =? 1 divided by 0.375 equals? Out of form calculation
• 17. 1,4,9,16,25?64,81
• 18. Four x minus three fifths equals five
• 19. 15 / 2 by 10 / 3 17 / 8 by 4 / 1 25 / 9 by 12 / 5 10 / 6 by 15 / 7 9 / 8 by 4 / 27 7 / 5 by 25 / 11 3 / 2 by 5 / 6 If it's right, I'll offer a reward. If it's wrong, I won't offer a reward 2 of 15 times 3 of 10, 8 of 17 times 1 of 4, 25 / 9 times 12 / 5, 10 / 6 times 15 / 7, 9 / 8 times 4 / 27, 7 / 5 times 25 / 11, 3 / 2 times 5 / 6
• 20. 1. Calculation: X-Y of X + y + Y-3 of 2x 2. Calculation: x + 3 of X & # 178; - X-2 divided by (2-x) + X + 3 of X + 1