1.

If the range of the parameter t in the interval (0,2π), satisfying −2x2+5x−10(sint)x2+2(1+sint)x+(9sint+4)>0 for all real values of x is (a,b), and (a+b)=kπ, then the value of k is

Answer» If the range of the parameter t in the interval (0,2π), satisfying 2x2+5x10(sint)x2+2(1+sint)x+(9sint+4)>0 for all real values of x is (a,b), and (a+b)=kπ, then the value of k is


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