Simplify sin square (a-6 / π) + sin square (a + 6 / π) - Sin square a I can't use the formula even after reciting the math problem, Well, I think so. Standing and talking doesn't hurt your back. I feel confused when I do math problems

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• 1. Sin squared (Pie / 3 - x) + sin squared (Pie / 6 + x)=
• 2. Sin square 45-tan square 30 In addition, there is a 2 sin square 30 °× Tan 30 ° + cos 60 ° Tan 60 °
• 3. If the ratio of the two right sides of a right triangle is 3:4 and the length of the oblique side is 20cm, the height of the oblique side is______ ．
• 4. The length of the hypotenuse of a right triangle is 40cm, and the ratio of the two right sides is 3:4
• 5. The two right sides of a right triangle are 30cm and 40cm, the hypotenuse is 50cm, and the height of the hypotenuse is 50cm______ cm．
• 6. The length of the diagonal of a square with side length 1 is () A. Integer B. fraction C. rational number D. irrational number
• 7. It is known that one side of a right triangle is 20 meters long and the other side is 25 meters long?
• 8. Given the degree of the opposite angle of the long and short straight sides of a right triangle, how to find the short straight side? The problem is how to find the tan degree. Example: choose a question (choose one of the following two questions, if you have done two questions, only score according to question (1)) (1) As shown in the figure, the elevation of the top of the tree measured from point C is 33 & ordm;, BC = 20m, then the tree height ab ≈___________ Meter (calculated with calculator, the result is accurate to 0.1 meter)
• 9. Given that the two right sides of a right triangle are 7 and 11.5, find the diagonal degree of 7
• 10. Find side length: right triangle angle is 5 degrees, adjacent side is 15 cm, find diagonal side length
• 11. Meteorological statistics show that every 1000 meters increase in altitude, the temperature will decrease by about 6 ℃. Now the surface temperature is 25 ℃, so the temperature at 10000 meters is about 10 ℃______ ．
• 12. At 1:00, 7:00, 13:00 and 19:00 on a day, the meteorological team measured the temperatures of 16, 18, 27 and 19 degrees respectively. What is the average temperature on that day
• 13. How does weather station measure temperature
• 14. The temperature measured by a weather station in a certain place at four different times of a day is as follows: 3 ℃ below zero at 6:00 a.m., 1 ℃ above zero at 12:00 noon, 0 ℃ at 4:00 p.m., and 9 ℃ below zero at 12:00 p.m. (1) the temperature at these four different times is expressed by positive or negative numbers. (2) how much higher is 6:00 a.m. than 12:00 p.m. (3) how much lower is 4:00 p.m. than 12:00 p.m
• 15. Turn 48 degrees, 25 minutes, 48 seconds into degrees
• 16. 36 degrees 31 minutes 48 seconds = () degrees
• 17. Find the extremum of function f (x, y) = x & sup3; - 4x & sup2; + 2xy-y & sup2; + 5
• 18. 2x+8y-xy=0 2x+8y=xy 2/y + 8/x=1 x+y = 2x+8y-xy=0 2x+8y=xy 2/y + 8/x=1 x+y =(x+y)*1 =(x+y)(2/y + 8/x) =8+2+ 2x/y +8y/x ≥10+2√[(2x/y)(8y/x)] =10+2√16=18 The minimum value is 18 What you don't understand = 8 + 2 + 2x / y + 8y / X ≥10+2√[(2x/y)(8y/x)] =10+2√16=18 How can 2x / y + 8y / X be equal to 2 √ [(2x / y) (8y / x)] and 2 √ 16
• 19. Given the square of X + the square of Y + 4x-8y + 20 = 0, find the square of x = the square of Y
• 20. How to distinguish between the end of the first second, the beginning of the third, within the second and within the first two seconds