3x^4+5x^3+6x^2+7x+5+cos x=0 What is the number of real solutions of x?

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\sqrt{({3 x}^{2} - 7 x - 30)} - \sqrt{({2 x}^{2} - 7 x - 5)} = x - 5

\sqrt{({3 x}^{2} - 7 x - 30)} - \sqrt{({2 x}^{2} - 7 x - 5)} = x - 5

(x^{2} - 7 x + 11)^{x^{2} - 11 x + 30} = 1

\int (\frac{3 x^{4} - 5 x^{3} + 4 x^{2} - x + 2}{x^{3}}) d x

\int (\frac{3 x^{4} - 5 x^{3} + 4 x^{2} - x + 2}{x^{3}}) d x

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