The value of M which makes cosx = 1-m meaningful is () A. M ≥ 2B. M ≤ 0C. 0 ≤ m ≤ 2D. M < - 1 or M > 1

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• 1. Cos x ≤ 1 / 4, find the value range of X
• 2. SiNx > cosx, then the value range of X is 0
• 3. If SiNx * cosx = 1-2m, the range of M is?
• 4. SiNx + cosx = √ 2m, find the value range of M
• 5. If SiNx radical 3 times cosx = 2m-3, then the value range of M is the same
• 6. It is known that for any x belonging to R, y = (cosx) ^ 2-2msinx-2m-2 is always negative
• 7. A rectangular lawn, 50 meters long and 30 meters wide, with 12000 scale to draw this lawn plan
• 8. A rectangular lawn is 30m long and 15m wide, and the scale is 1:1000. How long and how wide is the plan of the lawn
• 9. Because a (a ^ 2 + 2A + 3) = a ^ 3 + 2A ^ 2 + 3a, factorization a ^ 3 + 2A ^ 2 + 3A = ()
• 10. A ^ 3 + 3A ^ 2-2a factorization help, thank you
• 11. What is the value range of SiNx + cosx?
• 12. Given the point m (1-A, 2A + 2), if the symmetric point of point m about X axis is in the third quadrant, then the value range of a is in the third quadrant______ ．
• 13. If the point m (1 + A, 2A + 2) is in the third quadrant, the value range of a is obtained It's a process
• 14. If the three sides of the triangle are 3, 1-2a and 8, then the value range of a is () A. - 6 ＜ a ＜ - 3B. - 5 ＜ a ＜ - 2C. 2 ＜ a ＜ 5D. A ＜ - 5 or a ＞ - 2
• 15. If the three sides of the triangle ABC are m2-1,2m, M2 + 1, the maximum angle is If the three sides of the triangle ABC are m square - 1,2m, m square + 1, then the maximum angle is ()
• 16. In △ ABC, the lengths of edges a, B and C are M2 + m + 1, 2m + 1 and M2-1 respectively. Find the maximum angle of the triangle
• 17. The two equations of X (M + 5) * 2 - (2m-5) + M-8 = 0, (1) find the value of M; (2) find the length of three sides of triangle ABC Sorry, the last question is wrong, now add. Thank you, you master! It is known that ⊿ ABC, a, B and C are the opposite sides of ⊿ A and ⊿ B ⊿ C (a > b) of triangle ABC, and a ^ 2 + B ^ 2 = C ^ 2. Sina and AINb are two of the equations (M + 5) x ^ 2 - (2m-5) x + M-8 = 0 of X respectively, (1) find the value of M; (2) find the length of three sides of ⊿ ABC
• 18. If the three sides of triangle ABC are the square of M minus 1,2m, and the square of m plus 1, the maximum angle is
• 19. If the lengths of the three sides of △ ABC are M2-1, 2m, M2 + 1 (M > 1), then the degree of the largest angle is______ ．
• 20. In the isosceles triangle ABC, D is the midpoint of BC, de ⊥ AB, DF ⊥ AC, and the perpendicular feet are e and f respectively （1）△BDE≌△CDF (2) When ∠ A is equal to what degree, Quad AEDF is square? Prove your conclusion Point D is on BC, and a is the vertex angle