मान लीजिए $f: R \rightarrow R$ एक फलन है जो $f(x)=\frac{4^x}{4^x+2}$ द्वारा परिभाषित है और $M=\int_{f(a)}^{f(1-a)} x \sin^4(x(1-x)) dx,$ $N=\int_{f(a)}^{f(1-a)} \sin^4(x(1-x)) dx;$ $a \neq \frac{1}{2}.$ यदि $\alpha M=\beta N,$ $\alpha, \beta \in N,$ तो $\alpha^2+\beta^2$ का न्यूनतम मान $.....$ है।

  • A
    $4$
  • B
    $5$
  • C
    $6$
  • D
    $7$

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