यदि $y=5 \sin x+6 \cos x$ है,तो $y^2+(y_1)^2=$ . . . . . .

  • A
    $61$
  • B
    $(5 \sin x-6 \cos x)^2$
  • C
    $5 \cos x-6 \sin x$
  • D
    $0$

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