How to calculate the slope of a straight line with an angle of 48 ° with the x-axis? I only know that the tutor of x-axis is 48 degrees,

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• 1. What is the linear equation that passes through point a (1,2) and has a slope of half?
• 2. It is known that the direction vector of the line L1 is a = (1,3), and the direction vector of the line L2 is b = (- 1, K). If the line L2 passes through the point (0,5), the direction vector of the line L2 is b = (- 1, K), And L1 is perpendicular to L2?
• 3. The center of the circle q is on the positive half axis of X, the line l1:3x + 4y-8 = 0 is tangent to the circle Q, and the line L2 with the slope k passing through the point P (0,2) intersects the circle Q at two points a and B The radius of the circle is 2 The equation for finding circle Q Finding the value range of real number k Is there a constant k such that the vector OA + ob is collinear with PQ? If there is a constant K, there is no reason
• 4. The line L1: y = (K / 3-2k) × (x + 2) passing through the point (- 1,1) with a slope of 3 / K + 2 is parallel 2 and the line L: mx-m & # 178; y = 1, which is perpendicular to the point P (2,1), the equation is?
• 5. If the slope of line L1 is 2, L2 passes through point P (0,2) Q (x, 10), L1 is parallel to L2, then log2x =?
• 6. It is known that the slopes of two straight lines L1 and L2 are the two roots of the equation 3x ^ 2 + MX-3 = 0, m ∈ R Then L1, L2
• 7. Let a (- 1,0) B (1,0) line L1 and L2 pass through two points a and B respectively, and the product of slope is - 4
• 8. Given that the line L1 = 2x + 3, the line L2 and L1 are symmetric with respect to the line y = - x, then the slope of the line L2 is?
• 9. The inclination angle of the line L1 is 120 ° if the line L2 and L1 are symmetrical about the X axis, then the inclination angle of the line L2 is - the slope is——
• 10. Given the line L1: x + Y-1 = 0, L2: 2x-y + 3 = 0, the equation of the line L2 with respect to the line L1 symmetric is obtained
• 11. Through the point (- 2,1), the tangent of the tilt angle is half of the linear equation
• 12. Why is the slope tangent to the tilt angle Today, I learned that the coefficient of the linear equation directly affects the inclination angle of the line in the coordinates, and then the coefficient can be calculated through the tangent of the inclination angle. Well, it can be calculated in this way, but why? What's the principle? Please tell me in detail. Thank you
• 13. If there is a definition: int a, B;, through the statement scanf (% d;% d ", & A, & B);, the integer 3 can be assigned to the input data of variable a, and the integer 5 can be assigned to the input data of variable B It's (c) A． 35 B． 3,5 C． 3；5 D． 35 Why don't b commas correspond?
• 14. If the intersection of the line y = K1X + B1 and the line y = k2x + B2 is on the x-axis, then a K1 = K2, B B1 = B2, C k1b2 = K2, D K1 + B1 = K2 + B2
• 15. (kg / km) = D ^ 2 * 0.7854 * g * n * K1 * K2 * C / what does 2 after diameter power mean
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• 17. -1=k1+k2 5=3k1+k2/3
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• 19. If the chemical equilibrium constants of the reaction at 298k398k are k1k2 and the reaction is ammonia synthesis from nitrogen and hydrogen, K1 is greater than K2 Isn't the chemical equilibrium constant only related to temperature
• 20. Example: A1 * B1 = C1 & D1 & E1 & F1 & G1 & H1 & I1 & J1 & K1 & L1 = $234567 The number of digits of the calculation results of the two cells is variable, which is arranged from one digit to ten million digits respectively, with a limit of 10 digits. A currency symbol is displayed in the cell before the highest digit, and no significant number in front of the currency symbol is displayed as a space