Simplification: asin0 ° + bcos90 ° + ctan180 °; - P (square) cos180 ° + Q (square) sin90 ° - 2pqcos0 ° We also know that Tana = - 3 / 4, find Sina, cosa. We know that cosa = 0.68, find Sina, Tana (retain 2 significant digits). Simplify a (square) Cos2 π - B (square) SIN3 π / 2 + abcos π - absin π / 2

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• 1. Several usages of Dash: select the function of Dash: a) explain b) voice lengthen C) topic change d) further explain Annie is a girl full of vitality, extraordinary patience and rich imagination --- a natural teacher 2. This is a special typeface specially printed for the blind - "reading" through the feeling of hand 3. Thank Annie for giving me the ability to speak this precious gift Note: for the text, please refer to Lesson 18, Volume 11, Xiaoyu, Western normal school edition, always remember you, teacher
• 2. It is known that the perimeter of a rectangle is 45cm and the length of one side is ACM, then the area of the rectangle is as follows:
• 3. Given the equation x ^ 2-kx-2 = 0 about X, let the two equations be X1 and X2, and 2 (x1 + x2) > x1x2, find the value range of real number K
• 4. -4.5 + (- 17 / 3) equals
• 5. 15-1 out of 8 is equal to?
• 6. How to establish the connection between the zero point of function and the root of equation?
• 7. Solve the equation 1 / 7: x = 9 / 14: 3 Solve the equation 1 / 7: x = 9 / 14: 3
• 8. Is the solution of the equation x = 40 or 40
• 9. If there are only four positive integer solutions to the inequality 2x-a ≤ 0, the value range of a is obtained
• 10. What is origin symmetry in plane rectangular coordinate system
• 11. The circumference of a circle is 4 π cm, and its area is______ Square centimeter
• 12. The radius of a sector is 30cm, the center angle is 120 ° and it is used as the side of a cone______ ．
• 13. Make a rectangle with two squares of 1 cm in length. What's the perimeter of the rectangle?
• 14. As shown in the figure, in RT △ ABC, ∠ C = RT ∠, three semicircles are made by taking the three sides of the right triangle as the diameter, then the relationship among S1, S2 and S3 is as follows:______ ．
• 15. Find the equation that passes through the intersection of the straight line / 1:2x + 3y-5 = 0, / 2:3x-2y-3 = 0, with an inclination angle of 45 degrees!
• 16. The focus of the ellipse is f1.f2, and there is a point P on the ellipse, so that the angle f1pf2 is equal to 120 degrees, then the value range of eccentricity e of the ellipse is? Answer The focus of the ellipse is f1.f2, and there is a point P on the ellipse, so that the angle f1pf2 is equal to 120 degrees, then the value range of eccentricity e of the ellipse is? The answer is [root 2 / 3.1]
• 17. Using C + + to calculate the approximate value of definite integral function requirements: 1) the left and right end points of the input interval; 2) using rectangular method and parabolic method to calculate the definite product of user-defined function Using C + + to find the approximate value of F (x) = x * x - 2 * x - 1 by rectangle method and parabola method, and using C + + to find the approximate value of definite integral
• 18. Given that the two points of equation 2x-5x-7 = 0 are - 1,7 / 2, then the distance between the image of quadratic function y = 2x-5x-7 and the two intersections of X axis is
• 19. If x = 1 is a solution of the quadratic equation AX2 + bx-40 = 0 and a ≠ B, then the value of A2 − b22a − 2b is______ ．
• 20. 1 / 1 + 2 + 1 / 1 + 2 + 3 + 1 / 1 + 2 + 3 + 4 + +1/1+2+3+…… +20 = m / N. where m and N are positive integers and have no common divisor. Find m + n