If the maximum value of the function y = a SiNx + 3cosx + 1 is 6, then a=

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• 1. If the curve V is the square of the surface y = x, y = x, x + y + Z = 2, and z = 0 is the defined area, then fffdxdydz =? Calculus
• 2. Who can clearly tell me how to calculate double integral Just in contact with two-dimensional random variables in probability theory, it's difficult to be solved by double integral. How can this problem be solved For example, ∫ e ^ - (x + 2Y) x, Y > 0 Is the upper and lower limits x ~ 0,0 Should I separate ∫∫ e ^ - (x + 2Y) into ∫ e ^ - x ∫ e ^ - 2Y and then calculate the integral separately, or should I integrate the e ^ - (x + 2Y) integral again, but if so, there are two variables in it. How should I calculate the integral The upper limit is x and Y. who will write me a specific process The original problem is f (x, y) = AE ^ - (x + 2Y), x, Y > 0, finding constant A. I just want to know the algorithm of this type of problem
• 3. Using spherical coordinates to calculate triple integral I = ∫∫∫ Z ^ 2dV, where the graph is composed of x ^ 2 + y ^ 2 + Z ^ 2
• 4. Party A and Party B want to jointly contract a project. Party A will complete the project within 30 days and Party B will complete the project within 20 days. The contract stipulates that the project will be completed within 15 days. Otherwise, a fine of 1000 yuan will be imposed for each day. Party A and Party B sign the contract after discussion. (1) under normal circumstances, can party A and Party B perform the contract? Why? (2) Now they have cooperated in 75% of the project. Because there is something urgent elsewhere, one person must be transferred. Who is more suitable? Why?
• 5. Calculating volume by double integral V is the sphere x ^ 2 + y ^ 2 + Z ^ 2
• 6. Double integral of basic high number 1.∫∫D（x²-y²)dxdy ,0
• 7. The geometric meaning of double integral is volume, but double integral can produce negative number,
• 8. It is proved that the volume bounded by the tangent plane of any point on the cubic (a > o) of the surface XYZ = A and the three coordinate planes is a certain number The answer is: surface XYZ = A & # 179; the normal direction of (x0, Y0, Z0) is {y0z0, z0x0, x0y0} The tangent plane is: y0z0 (x-x0) + z0x0 (y-y0) + x0y0 (z-z0) = 0 Its intercept on three coordinate axes are 3x0, 3y0 and 3z0 The volume of the tetrahedron bounded by the tangent plane and three coordinate planes is: 27x0y0z0 / 6 = 9A & # / 2 My question is, how do you calculate the intercept above!
• 9. The tangent plane equation at point P (1.1.1)
• 10. Surface x2 + Y2 + Z = 9 tangent plane equation at point 124
• 11. Find the minimum positive period of F (x) = SiNx / 2 quartic power + cosx / 2 quartic power + quarter root sign three times sin2x
• 12. Y = (SiNx + cosx) ^ 2 + 2cosx ^ 2, find the decreasing interval, maximum and minimum
• 13. How to calculate the integral of 1 / ((SiNx + cosx) ^ 2)? RT
• 14. If x is an internal angle of a triangle, then what is the range of the function y = SiNx + cosx? Why 45
• 15. If x is the smallest internal angle in a triangle, then the range of the function y = SiNx + cosx is () A. [12，22]B. （0，32]C. （1，2]D. （12，22]
• 16. Expressing arcsin5 / 13 + arccos (- 3 / 5) with an inverse trigonometric function value I want to ask why the final inverse triangle is expressed in COS instead of sin Is there anything particular about using sin or cos
• 17. Y = 1 + sin (2x) + 2cos ^ 2 (x) = 1 + sin (2x) + 1 + cos (2x) = 2 + sin (2x) + cos (2x) = 2 + √ 2Sin (2x + π / 4), so the period is π =2 + √ 2Sin (2x + π / 4)
• 18. It is proved that 3arccosx arccos (3x-4x & # 178;) = π, (- 1 / 2 ≤ x ≤ 1 / 2)
• 19. How to find the indefinite integral of (x + 1) / (x ^ 2 + 2x)?
• 20. Finding indefinite integral ∫ (e ^ 2x) / (2 + e ^ x) DX Such as the title